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Premium or Regular Unleaded?

 
Old 05-05-2019, 07:44 PM
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Premium or Regular Unleaded?

Which gas do you put in? Is it worth paying the extra 70+ cents for premium, in the short and long term?
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Old 05-05-2019, 07:56 PM
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Originally Posted by corners View Post
Which gas do you put in? Is it worth paying the extra 70+ cents for premium, in the short and long term?
3,750 miles over 3.5 months, never once used premium, even dealer admitted they use regular, as it is only "recommended" not required. I'm averaging 27.2 mpg to date, calculated. No complaints, plenty of power, no pinging.
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Old 05-05-2019, 07:57 PM
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AFAIK, the car requires premium. That said, many have driven with regular gas without the car blowing up.

The short answer is that if you're not getting detonation (knock) using regular gas on your usual commute then you'll be fine. You'll get a bit reduced power.
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Old 05-05-2019, 08:02 PM
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Originally Posted by JB in AZ View Post
3,750 miles over 3.5 months, never once used premium, even dealer admitted they use regular, as it is only "recommended" not required. I'm averaging 27.2 mpg to date, calculated. No complaints, plenty of power, no pinging.
What does it say on your filler door "required" or "recommended"?

Dealer uses regular because it is cheaper.
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Old 05-05-2019, 08:07 PM
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Originally Posted by ceb View Post
AFAIK, the car requires premium. That said, many have driven with regular gas without the car blowing up.

The short answer is that if you're not getting detonation (knock) using regular gas on your usual commute then you'll be fine. You'll get a bit reduced power.
Here's the label on the gas door ....


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Old 05-05-2019, 08:07 PM
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I ran the first 3000 miles on premium, switched to regular, and noticed no difference in fuel economy or on-the-road power.

Premium is ‘recommended’, not required. The same engine and transmission is used in the Accord, and that calls for regular. The Accord’s power is rated lower, so perhaps premium allows a bit more power at the top end with WOT. I did not notice any more power in daily use.
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Old 05-05-2019, 08:29 PM
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Originally Posted by JB in AZ View Post
Here's the label on the gas door ....


Learn something every day. The 2018's were "required". In that case, running premium will give you very little advantage.

However, if you are in higher altitudes (NM/CO for example) then 85 is "regular" and 89 is "premium". In that case, the 85 is OK as well.

Last edited by ceb; 05-05-2019 at 08:31 PM.
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Old 05-06-2019, 03:29 AM
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I've been using regular with no issues.

Some will say that buying a luxury vehicle means you can afford to pay for premium. Yes I can afford it but I dont need the extra hp boost for city driving.
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Old 05-06-2019, 06:05 AM
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I have run tier 1 regular in mine since day one. I am averaging 25.2 MPG with nearly 13K miles on her. No knocks, no issues.
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Old 05-06-2019, 07:14 AM
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The RDX makes 272 HP at 6500 RPMs. I never run it at 6500.
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Old 05-06-2019, 08:34 AM
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Those that state..you bought a $$$ car, use $$$$ gas...total garbage....go by the manual....simple as that....if it has to have $$$ gas it would say REQUIRED......Enjoy the new RDX
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Old 05-06-2019, 09:15 AM
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The short answer is that you will benefit from Premium in your RDX. Whether you want to pay the additional cost is a personal decision.
Here is the best video explanation that I have found, and is commented on by couple of experts from Car and Driver and is only 5 minutes long.

DavidH
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Old 05-06-2019, 09:51 AM
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Originally Posted by DHood View Post
The short answer is that you will benefit from Premium in your RDX. Whether you want to pay the additional cost is a personal decision.
Here is the best video explanation that I have found, and is commented on by couple of experts from Car and Driver and is only 5 minutes long.
https://www.youtube.com/watch?v=lAIT_vn0WSY

DavidH
Horsemnure. Premium will not help a car that is designed for regular. You're just flushing money down the toilet.
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Old 05-06-2019, 01:17 PM
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Originally Posted by ceb View Post
Learn something every day. The 2018's were "required". In that case, running premium will give you very little advantage.

However, if you are in higher altitudes (NM/CO for example) then 85 is "regular" and 89 is "premium". In that case, the 85 is OK as well.
The NSX is the only Acura model that requires premium. It is recommended in all other models. This has been true for many years.

The NSX requires 91 and recommends 93.
All others require 87 (not 85) and recommend 91.
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Old 05-06-2019, 01:38 PM
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I run regular Octane 87 and have for nearly 17k miles.. Have never had an issue and I still get great performance and over 24 mpg on average.
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Old 05-06-2019, 01:42 PM
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Originally Posted by zroger73 View Post
The NSX is the only Acura model that requires premium. It is recommended in all other models. This has been true for many years.

The NSX requires 91 and recommends 93.
All others require 87 (not 85) and recommend 91.
The '15 TLX I had required premium
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Old 05-06-2019, 02:48 PM
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Originally Posted by ceb View Post
Horsemnure. Premium will not help a car that is designed for regular. You're just flushing money down the toilet.
2019 is design to run or can take advantage on premium..
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Old 05-06-2019, 03:24 PM
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Originally Posted by Yotrek View Post
2019 is design to run or can take advantage on premium..
I think that more cars are like that now. With the advanced engine management available, some cars so designed can take advantage of higher octane gas without having regular cause any problems.

I always use top tier gas, and I think that that is very important in DI engines.
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Old 05-06-2019, 03:37 PM
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Originally Posted by Madd Dog View Post
I think that more cars are like that now. With the advanced engine management available, some cars so designed can take advantage of higher octane gas without having regular cause any problems.

I always use top tier gas, and I think that that is very important in DI engines.
Can you define "top tier gas"?
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Old 05-06-2019, 03:40 PM
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Originally Posted by zroger73 View Post
The NSX is the only Acura model that requires premium. It is recommended in all other models. This has been true for many years.

The NSX requires 91 and recommends 93.
All others require 87 (not 85) and recommend 91.
I'm not sure if you're referring to the current lineup, but the 4G TL owners manual and fuel cap states "Premium Fuel Only".

I've said this 100x in the past (with all of the wonderfully insightful fuel-octane threads ): Unless you live in an area where Premium fuel is way more expensive than regular, it's likely not going to cost much more in terms of cost-of-ownership to go with Premium. For example, here in Utah, the stepwise cost from regular to plus to premium is $0.15 each - so $0.30 for premium vs. regular. If you drive 15K miles a year and get 25MPG, you're looking at about 600 gallons a year. That's an extra $180.

$180 is $180, which would be great to save. But IMO, to best protect the engine from potential knock as well as get the most out of the engine, I'd go with premium. But that's just me. If the car were a lease and I was just using it for light duty commuting then regular might be the way to go. But I keep my cars forever and push the engine pretty hard so for me, premium is a no-brainer. It's also tuned for premium so I'm kind of locked in at this point. (I have a TL, not RDX).

Just noticed the OP said $0.70 more for premium That might be a deal killer. That's $420 more per year. That starts to hurt.

Last edited by losiglow; 05-06-2019 at 03:44 PM.
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Old 05-06-2019, 03:46 PM
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Old 05-06-2019, 03:57 PM
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Originally Posted by Tom_D View Post
And it doesn’t necessarily cost more either.
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Old 05-06-2019, 04:21 PM
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Originally Posted by Madd Dog View Post
And it doesn’t necessarily cost more either.
Sometime it is cheaper. COSTCO gas in the US is Top Tier
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Old 05-06-2019, 04:23 PM
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Originally Posted by Stew4HD View Post
The '15 TLX I had required premium
As did the TSX and RL and IIRC, the old RDX
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Old 05-06-2019, 04:23 PM
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Originally Posted by Madd Dog View Post
I think that more cars are like that now. With the advanced engine management available, some cars so designed can take advantage of higher octane gas without having regular cause any problems.

I always use top tier gas, and I think that that is very important in DI engines.
Agree with you Madd Dog..
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Old 05-06-2019, 06:02 PM
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Originally Posted by Stew4HD View Post
The '15 TLX I had required premium
Recommended. Not required. Taken right from the TLX owner's manual:

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Old 05-06-2019, 06:16 PM
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Yeah and the manual also says that lower octane gasoline can cause knocking and pre-detonation. I guess if I'm leasing the car that's fine, but if I'm keeping the car for the long run I'd rather not be penny-wise and pound-foolish.
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Old 05-06-2019, 06:20 PM
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Test all the octanes and see for yourself, worse case you only wasted a few bucks on a tank of 93.
I felt a increase of responsiveness when I use 93 vs 87, no difference if I just cruise on the highway at steady speed. I use a bit over 20 gallons a week where I am just cruising at steady speed. Personally I am still debating if it is worth the extra cost. Most people here agree that 87 won't break your car, however, I do put in a bottle of fuel injection cleaner every few thousand miles since I don't have "top tier" gas station around. I have been driving this route for over 10 years and mostly going to the same gas station and never had car trouble.
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Old 05-06-2019, 08:14 PM
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If the price difference was $0.15 cents more than premium, then it would be no issue. Here in IL it's normal to see a difference of $1 per gallon on premium. Costco is about $0.60 to $0.70 more per gallon. Looks like I will most likely will be using regular once I get my RDX. In my current maxima, I have used nothing but premium.
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Old 05-07-2019, 06:16 AM
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Are we still bothering to say "unleaded"? It's gotta be at least 30 years since I saw leaded gasoline sold anywhere except near race tracks.
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Old 05-07-2019, 07:02 AM
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Do you think that the use of regular grade gas, over a period of time, can have anything to do with RDX's that go into limp mode during heavy acceleration? For me I bought a high performance car and for a couple of hundred bucks a year I'm not willing to give up one horsepower or foot pound of torque in the name of economy.
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Old 05-07-2019, 07:47 AM
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Originally Posted by Tom_D View Post
Originally Posted by Madd Dog View Post
And it doesn’t necessarily cost more either.

Thanks guys. I have many of the TopTier listed fuel suppliers in my area, however I have never seen signage that advertises/confirms that. Have your fuel stops had signage stating TopTier, or do you just go by the listed fuel suppliers on the TopTier website? Obviously, I have never looked this deeply into fuel beyond just the octane rating.
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Old 05-07-2019, 09:28 AM
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Originally Posted by markm929 View Post
Thanks guys. I have many of the TopTier listed fuel suppliers in my area, however I have never seen signage that advertises/confirms that. Have your fuel stops had signage stating TopTier, or do you just go by the listed fuel suppliers on the TopTier website? Obviously, I have never looked this deeply into fuel beyond just the octane rating.
I dimly remember seeing a mention of Top Tier at a Shell station and I'm sure that other stations mention it as well but it certainly isn't in your face.

Me? While TopTier mostly gives you some guarantee of a standard, I'd rather get gas at a busy non-TopTier station (assuring fresher gas), that at a very slow TopTier station.

For example, neither Sheetz (a MD/VA/PA/OH/WV/NC chain) or Pilot (truck stops) are on the list, but I'd pick either one of those over some little mom-and-pop TopTier station that looks like it gets a customer a month.
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Old 05-07-2019, 09:33 AM
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Originally Posted by markm929 View Post
Thanks guys. I have many of the TopTier listed fuel suppliers in my area, however I have never seen signage that advertises/confirms that. Have your fuel stops had signage stating TopTier, or do you just go by the listed fuel suppliers on the TopTier website? Obviously, I have never looked this deeply into fuel beyond just the octane rating.
I go by brand name. I have been using only top tier since my first DI engine in 2007, when there were only a few near me, like Shell. Then Mobil/exxon came on, and a Sinclair replaced a Gulf station, and finally Sunoco signed on. So now, practically every name brand has signed on. Costco is on, but BJs is not.

Too, as recognized above, a busy station is always better, so if your good stations are not top tier, throw in some Techron every few thousand. Keep the fuel system clean.
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Old 05-07-2019, 04:35 PM
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Watch out!

Wawa is 92 instead of 93.

At least in Florida.....
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Old 05-08-2019, 01:39 AM
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This should be a poll, judging by the responses. I use premium. I don't see a need to go against the recommendation of the manufacturer.
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Old 05-08-2019, 09:26 AM
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I’ve tested this numerous times myself with premium recommend vehicles, I would suggest others do the same. This way you will not have to rely on what others have experienced. Fill a couple of tanks on premium and then a couple on regular. Track the mpg on both. Make notes on performance or even better, pick a long stretch of road and time your 0-60 or 0 to whatever. Have you experienced and improvement using premium? Great, then ask yourself if the improvement is worth the cost. If there was no improvement then ask yourself why you are paying more for no returns. I know what I have found with my vehicles. I use regular.
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Old 05-08-2019, 09:49 AM
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Originally Posted by FrankZZR View Post
I’ve tested this numerous times myself with premium recommend vehicles, I would suggest others do the same. This way you will not have to rely on what others have experienced. Fill a couple of tanks on premium and then a couple on regular. Track the mpg on both. Make notes on performance or even better, pick a long stretch of road and time your 0-60 or 0 to whatever. Have you experienced and improvement using premium? Great, then ask yourself if the improvement is worth the cost. If there was no improvement then ask yourself why you are paying more for no returns. I know what I have found with my vehicles. I use regular.
Great advice to folks! Thanks! I concur.

It's always fine to get others' opinions, just remember, "trust, but verify". Blindly following other's actions/opinions is never a good idea.
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Old 05-08-2019, 09:56 AM
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Originally Posted by omygod711 View Post
Test all the octanes and see for yourself, worse case you only wasted a few bucks on a tank of 93.
I felt a increase of responsiveness when I use 93 vs 87, no difference if I just cruise on the highway at steady speed. I use a bit over 20 gallons a week where I am just cruising at steady speed. Personally I am still debating if it is worth the extra cost. Most people here agree that 87 won't break your car, however, I do put in a bottle of fuel injection cleaner every few thousand miles since I don't have "top tier" gas station around. I have been driving this route for over 10 years and mostly going to the same gas station and never had car trouble.
I can't disagree that 87 won't break the car, since Acura says it's "ok". However, keep in mind that knock usually isn't audible to the passenger. According to some mechanics, including Ericthecarguy (on Youtube), on a scale of 1-10, knock as high as a 7 won't be heard by the passenger. That's just his opinion and the scale isn't some official quantitative measurement. But if that's even close to correct, it tells you that potential engine damage or at least increased wear due to knock could be occurring.

Again, that's just a theory and not necessarily substantiated. And if I weren't keeping the car for very long I wouldn't be concerned. But if you're looking to push that RDX to 300K miles, I'd probably consider premium.
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Old 05-08-2019, 09:59 AM
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Originally Posted by JB in AZ View Post
Great advice to folks! Thanks! I concur.

It's always fine to get others' opinions, just remember, "trust, but verify". Blindly following other's actions/opinions is never a good idea.
I would be careful going against the manufacturer's recommendation. What is in it for them to recommend premium if there was no benefit to it? We are not experts, so what we perceive as being OK may not reflect the reality that it is not.
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