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Request for those that put REGULAR gas in your RDX (gasp!)

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Request for those that put REGULAR gas in your RDX (gasp!)

 
Old 02-01-2019, 04:14 PM
  #121  
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Originally Posted by kurtatx View Post
Why would you go against the manufacturer's recommendation?...
Why would you do more than what the manufacturer required?... especially when there's no real world benefit.

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Old 02-01-2019, 06:18 PM
  #122  
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Originally Posted by MI-RDX View Post
Why would you do more than what the manufacturer required?... especially when there's no real world benefit.
Do you know Kurt?
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Old 02-01-2019, 07:36 PM
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Originally Posted by MI-RDX View Post
Why would you do more than what the manufacturer required?... especially when there's no real world benefit.
I chose to run premium in my 2019 RDX so that if I ever raced another 2019 RDX filled with regular then I'd win by a photo finish.

If you're going to track your RDX then by all means - run premium. For legal, safe, and courteous driving on public roads, there's no difference. If premium means entering the highway at 75 MPH instead of 74.9 MPH, then fuel grade is the least of my concerns.

DISCLAIMER: I use Honda-branded oil and filters and always use the recommended fuel type - even though it's not required.
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Old 02-02-2019, 07:12 AM
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Originally Posted by Midnight Mystery View Post
Do you know Kurt?
Kurt who?
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Old 02-02-2019, 07:36 AM
  #125  
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Originally Posted by MI-RDX View Post
Why would you do more than what the manufacturer required?... especially when there's no real world benefit.
So if I tell you to eat banana you'd be silly enough to ignore my recommendation to keep it first.
​​​​​
And that if Honda knows more about the car it designed and built than you do? If there is no real world benefit, than why does Honda recommend it?
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Old 02-02-2019, 08:16 AM
  #126  
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Originally Posted by kurtatx View Post
...
And that if Honda knows more about the car it designed and built than you do? ...
They do, and they are the ones saying 87 is required.

And if anyone can show me a 30% increase in real world benefit to offset the 30% increase in fuel cost I'll be the first one in line at the 91/93 octane pump.

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Old 02-02-2019, 09:48 AM
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Originally Posted by kurtatx View Post
So if I tell you to eat banana you'd be silly enough to ignore my recommendation to keep it first.
​​​​​
And that if Honda knows more about the car it designed and built than you do? If there is no real world benefit, than why does Honda recommend it?
That is the interesting question “why does Acura recommend 91 octane”? Here are my theories why a manufacturer would recommend premium:
1. They believe buyers will think the car is more premium if they recommend premium
2. They want to advertise the best HP & Torque ratings and the only way to achieve that is with higher octane fuel
3. Big Oil companies/Goverment (To get better gas tax revenue) have aligned with car makers in some way to “encourage” higher octane recommendations (I know this one is far fetched but you never know as “money” leads to all kinds of decisions in society.
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Old 02-02-2019, 11:27 AM
  #128  
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Originally Posted by Midwestuser1 View Post

That is the interesting question “why does Acura recommend 91 octane”? Here are my theories why a manufacturer would recommend premium:
1. They believe buyers will think the car is more premium if they recommend premium
2. They want to advertise the best HP & Torque ratings and the only way to achieve that is with higher octane fuel
3. Big Oil companies/Goverment (To get better gas tax revenue) have aligned with car makers in some way to “encourage” higher octane recommendations (I know this one is far fetched but you never know as “money” leads to all kinds of decisions in society.
Yeah, I'm pretty sure it's just what the car is designed to use.

But sure, you guys do you, but remember Stew4HD complains constantly and will likely sell the car long before there are any ill-effects from using the wrong fuel in the engine.
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Old 02-02-2019, 11:51 AM
  #129  
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Mazda is the only company in this class that I know of to state a lower HP when using regular gas, about 40hp difference (specifically on the CX-5). It doesn't state anything else with adverse effects of reliability.

That being said. I know folks who lease cars will just put whatever cheapest gas in their car. They don't care about longevity nor reliability.

Trust your manufacturer recommendation and remember this engine isn't a "premium" engine, it's the same one that's in the Honda's.


Last edited by acuraada; 02-02-2019 at 12:04 PM.
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Old 02-02-2019, 12:02 PM
  #130  
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Originally Posted by Midwestuser1 View Post

That is the interesting question “why does Acura recommend 91 octane”? Here are my theories why a manufacturer would recommend premium:
1. They believe buyers will think the car is more premium if they recommend premium
2. They want to advertise the best HP & Torque ratings and the only way to achieve that is with higher octane fuel
3. Big Oil companies/Goverment (To get better gas tax revenue) have aligned with car makers in some way to “encourage” higher octane recommendations (I know this one is far fetched but you never know as “money” leads to all kinds of decisions in society.
Number 1 is, to me anyhow, the likely reason - product image.

Anyone remember the old Marlboro cigarette ads - the one with the cowboy on horseback? Solely to promote a product image of rugged manliness, the product itself was no different than any other on the market. (BTW, the 'cowboy' was reputed to have died from lung cancer.)
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Old 02-02-2019, 03:11 PM
  #131  
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Now That's Funny

Originally Posted by skarface View Post
The RDX will self destruct if you put in regular. It will realize its the same engine and transmission in a Honda that uses regular and die in shame when it realizes its been pretending to be a luxury vehicle this whole time.
Now That's Funny!!!
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Old 02-02-2019, 05:19 PM
  #132  
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Originally Posted by MI-RDX View Post
Number 1 is, to me anyhow, the likely reason - product image.

Anyone remember the old Marlboro cigarette ads - the one with the cowboy on horseback? Solely to promote a product image of rugged manliness, the product itself was no different than any other on the market. (BTW, the 'cowboy' was reputed to have died from lung cancer.)
#2 also. It lets them get better numbers.


Now, if only the gas stations would be more cooperative. Instead of all islands having pumps for both grades, one island could have only regular, and the other island only premium. Then the people who use premium would only be seen with other premium cars, and would get shorter lines, too. Also, at concierge stations, maybe they would bring out donuts and coffee for the ‘premium’ crowd. That could make a difference.
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Old 02-02-2019, 07:54 PM
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Originally Posted by Midwestuser1 View Post

That is the interesting question “why does Acura recommend 91 octane”? Here are my theories why a manufacturer would recommend premium:
1. They believe buyers will think the car is more premium if they recommend premium
2. They want to advertise the best HP & Torque ratings and the only way to achieve that is with higher octane fuel
I'll take door #2.

The difference may be small, but in the world of marketing a win is a win.

But to be clear, the engine needs to be tuned to take advantage of the higher-grade fuel.

Modern engines have knock sensors and their engine controllers will de-tune as necessary to prevent major engine damage. The converse is NOT necessarily true. An engine tuned to run on regular will not necessarily give better performance running on premium fuel. It won't "up-tune". ( I'm leaving ethanol out of the discussion only because I get tired of repeating myself. Sometimes. )

But engines tuned to run on regular may benefit from higher-grade fuel under strenuous conditions, such as towing, because those conditions may be more likely to cause pre-ignition ( knock ). The Owner's Manual for Honda Pilot does recommend running premium fuel for towing.

Acura and Honda Owner's Manuals don't say anything about racing, except in the warranty section.

Last edited by Wander; 02-02-2019 at 07:59 PM.
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Old 02-02-2019, 08:36 PM
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Could the reason for recommending premium fuel to meet the current emission standards? I think we all agree there is next to no noticeable performance improvements running the good stuff.
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Old 02-02-2019, 08:48 PM
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Originally Posted by Gee-vee View Post
Could the reason for recommending premium fuel to meet the current emission standards? I think we all agree there is next to no noticeable performance improvements running the good stuff.
I'm pretty sure it's so they can advertise the extra 10hp or so performance gain that no one will actually notice.
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Old 02-02-2019, 08:52 PM
  #136  
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Originally Posted by Gee-vee View Post
Could the reason for recommending premium fuel to meet the current emission standards?...
No. If that were the reason then 91 octane would be required as the EPA would not certify the engine for 87 octane.

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Old 02-02-2019, 10:06 PM
  #137  
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Originally Posted by Madd Dog View Post
Also, at concierge stations, maybe they would bring out donuts and coffee for the ‘premium’ crowd. That could make a difference.
ooh, maybe they could pump the gas for us, and check our oil. How weird would THAT be??

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Old 02-02-2019, 10:19 PM
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Originally Posted by Sounds View Post
ooh, maybe they could pump the gas for us, and check our oil. How weird would THAT be??
There was a time when that was the standard, not concierge service. But at that time, checking the oil wasn't just for show. Cleaning the windshield was a nice touch.

Aren't full-service stations still required by law in New Jersey and Oregon? But I don't think they clean windshields anymore.
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Old 02-03-2019, 09:40 AM
  #139  
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Does anyone have any first hand experience using an allowable but not recommended octane and having engine failure? Acura says that 91 is recommended but there may be problems/damage if you use below 87. I have never used 91 on any of my Acura cars and they have all gone well over 100,000 miles with absolutely no problems with the engine. 167,000, 106,000, 184,000, 280,000 miles. Each used 87 octane. By my calculation I save between $700 - $1000 per year by running 87 octane. BTW I can afford the car and I can afford any gas. I just can't see any reason to pay an extra $1000 per year for no benefit or loss of performance. And the 280,000 mile car is running just fine right now.
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Old 02-03-2019, 12:02 PM
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Originally Posted by quantum7 View Post
Does anyone have any first hand experience using an allowable but not recommended octane and having engine failure? Acura says that 91 is recommended but there may be problems/damage if you use below 87. I have never used 91 on any of my Acura cars and they have all gone well over 100,000 miles with absolutely no problems with the engine. 167,000, 106,000, 184,000, 280,000 miles. Each used 87 octane. By my calculation I save between $700 - $1000 per year by running 87 octane. BTW I can afford the car and I can afford any gas. I just can't see any reason to pay an extra $1000 per year for no benefit or loss of performance. And the 280,000 mile car is running just fine right now.
I run premium because it’s only about 20-30 cents more a gallon here at Costco, although other gas stations are sometimes 50 cents to 1 dollar more. I can justify 20-30 cents but not $1 more a gallon. Cars have knock sensors and worst case it will dial back on the amount of boost you can have if it’s predetonating (at least it should) which would mean less power, but doesn’t seem to be an issue. If you save $700-1000 a year and you have the car for let’s says 10 years and the engine goes because of this, well your $7000-$10000 richer and a new engine is cheaper then this. And the engine could go anyways for other reasons, but honestly with Honda’s engine reputation I don’t see any issue running 87 when that is the minimum required, if that was a bad idea they would of said so, if you were to reprogram your computer with hondata new flash then you would no doubt want to use higher octane fuel when increasing the boost pressure. Really comes down to are you getting knock with the lower octane fuel, if not then it’s no problem. All higher octane means is it can resist ignition better under pressure, more pressure the more resistance you need

Last edited by Dereileak; 02-03-2019 at 12:15 PM.
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Old 02-03-2019, 12:24 PM
  #141  
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Originally Posted by Wander View Post
There was a time when that was the standard, not concierge service. But at that time, checking the oil wasn't just for show. Cleaning the windshield was a nice touch.

Aren't full-service stations still required by law in New Jersey and Oregon? But I don't think they clean windshields anymore.
Yes, in NJ, but if you ask them to do stuff, you should tip them, IMO.
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Old 02-03-2019, 12:29 PM
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I would like to capture the boost pressure when running lower octane fuel. I ran premium and was getting 10.9 as my max boost flooring it in sport mode



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Old 02-04-2019, 02:18 PM
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Here’s my stab at a Last Post for this over-long thread:

1. Acura requires a minimum octane of 87 to avoid engine damage.

2. Acura recommrends a minimum octane of 91.

3. Using the permissible lower-octane fuel degrades performance in ways that are perceptible to some people and imperceptible to others.

4. Among those who do perceive a difference in performance, there are those who find the difference to be worth the higher price of higher-octane gas and those who don’t.

5. Depending on your position on numbers 3 and 4 above, decide which to buy.
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Old 02-04-2019, 04:34 PM
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You all are killing me. I lease my car. In 30 months I’ll turn the car in. I filled with 93 octane last week, no change in mileage or performance. The car does not require anything above 87 octane. If you want steak, order steak. Let’s talk about things that matter.
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Old 02-04-2019, 04:42 PM
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Originally Posted by Bartrdx View Post
Let’s talk about things that matter.
Easy. Click on a different thread.

Like maybe an engine oil thread...

Last edited by Wander; 02-04-2019 at 04:46 PM.
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Old 02-04-2019, 05:31 PM
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Originally Posted by Wander View Post
...Like maybe an engine oil thread...
Yep, no controversy when it comes to that subject.

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Old 02-05-2019, 02:07 PM
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Well after running 4 or 5 tanks of premium I put in a gallon of regular, tank was empty. I run my RDX pretty hard, use Sport + a lot, and like to feel the acceleration and SH-AWD in action. Seat of the pants I notice zero difference, will be running regular from now on. It's not like it's a performance vehicle which will really benefit, Premium or Regular it still bogs down horribly because of the turbo lag.

Last edited by spinedoc777; 02-05-2019 at 02:10 PM.
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Old 02-05-2019, 03:03 PM
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Originally Posted by spinedoc777 View Post
Well after running 4 or 5 tanks of premium I put in a gallon of regular, tank was empty. I run my RDX pretty hard, use Sport + a lot, and like to feel the acceleration and SH-AWD in action. Seat of the pants I notice zero difference, will be running regular from now on. It's not like it's a performance vehicle which will really benefit, Premium or Regular it still bogs down horribly because of the turbo lag.
so premium or regular still suffer from turbo lag?, not good..

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Old 02-07-2019, 06:41 PM
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Originally Posted by Yotrek View Post
so premium or regular still suffer from turbo lag?, not good..
From others on the forum I now understand it's not turbo lag, but rather the transmission computer takes a few seconds to decide what to do. I was speaking to my service manager today and we were discussing my issues with slowing down, applying throttle and feeling nothing for 1-2 seconds. He asked what gas I was using, I had been using premium until my last fill up, which was regular. He said even though regular won't hurt the engine, I probably lost about 20hp and would probably experience lower mileage. Hmm, seat of the pants the power feels the same. It is possible the hesitation has worsened so I'm going to go back to premium for a couple of tanks and see if that helps, if it doesn't then I will go onto regular forever.
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Old 02-07-2019, 06:52 PM
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Originally Posted by spinedoc777 View Post
From others on the forum I now understand it's not turbo lag, but rather the transmission computer takes a few seconds to decide what to do. I was speaking to my service manager today and we were discussing my issues with slowing down, applying throttle and feeling nothing for 1-2 seconds. He asked what gas I was using, I had been using premium until my last fill up, which was regular. He said even though regular won't hurt the engine, I probably lost about 20hp and would probably experience lower mileage. Hmm, seat of the pants the power feels the same. It is possible the hesitation has worsened so I'm going to go back to premium for a couple of tanks and see if that helps, if it doesn't then I will go onto regular forever.
LOL.

20hp and less mpg? You should point him to the AAA study that suggests such drop in hp/mpg are likely miniscule.

Such strongly worded statements with no basis in fact is a bit concerning for someone who works with automobile products on a daily basis....

We already know many car salesmen are bumbling idiots, but a service manager....sigh
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Old 02-07-2019, 07:09 PM
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Originally Posted by skarface View Post
I heard if you use 87, your infotainment system crashes to spite you.
I LOL'd at this. But....I use premium, and my infotainment still crashes. Go Figure.
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Old 02-07-2019, 07:14 PM
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Originally Posted by nist7 View Post
LOL.

20hp and less mpg? You should point him to the AAA study that suggests such drop in hp/mpg are likely miniscule.

Such strongly worded statements with no basis in fact is a bit concerning for someone who works with automobile products on a daily basis....

We already know many car salesmen are bumbling idiots, but a service manager....sigh
Yeah he was very confident in this. I didn't want to be a pain and point out studies and such so I just let it be. I'm going to give premium one more try, but I'm 99.9% certain it will be regular for me.
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Old 02-07-2019, 09:52 PM
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I will be honest, I normally run premium, and the other day I ran regular and my gas mileage was down about 2mpg, and I had 3 less people in the car. I also felt the car did not feel as preppy and quick as with premium. If it costs 30 cents more ill run premium, if its 50 cents to 1 dollar more ill run regular, but I honestly felt a slight difference, not a lot, but a little bit, I do want to read the boost psi readings when on regular, I am wondering if they dial that back a little
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