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Which type of gas?

Old 01-09-2019, 02:00 PM
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Question Which type of gas?

I read that Acura's require premium. My sales guy said he advises customers, and in his own car uses Plus (middle grade) with no issues. This is what I liked about my previous Genesis, I could put regular in it all day long. Can I scrimp a bit, or should I make sure I put in premium all the time?
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Old 01-09-2019, 02:05 PM
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https://acurazine.com/forums/third-g...x-gasp-976228/

Basic factual summary:
Acura only requires premium for the NSX.
Acura recommends 91 octane for the RDX for optimal performance.
Less than 87 octane can lead to engine damage in the RDX. (like who does this anyway...lol)

AAA has done a study and showed that the % increase in premium gas does not translate to a proportional increase in MPG/HP. On a pure mathematical basis of dollar per MPG/HP, premium/mid grade is not worth the additional cost.

Up to each driver to decide if it is worth it to get mid or premium gas.

87 octane from a top tier gas station is perfectly fine for the RDX. But others want to maximize mpg/hp at a higher proportional cost and always go for premium. No wrong answer either way. But some people may feel very strongly about their personal decision one way or the other.
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Old 01-09-2019, 02:07 PM
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I've always put Premium on my cars (Acura and BMW) as "recommended". I've heard other people using Plus with no issues and read some Article about no difference between using Plus and Premium, but my OCD doesn't let me do that.

I think you'll be fine with Plus.
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Old 01-09-2019, 02:12 PM
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Yeah I feel like Plus is hedging my bet a little. I can afford the extra $80 or so per month, but hey if it's free money. Well with Plus I suppose it's more like $40 or so every month.
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Old 01-09-2019, 02:16 PM
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If you have some time, this is a nice read: https://newsroom.aaa.com/2017/12/don...s-worth-price/

AAA actually parsed out the language and there is a difference between "requirement" and "recommended."

It certainly wasn't what I expected as I too would always go for what is "recommended" but the data appears to point otherwise.

In a parallel example, the NSX recommends 93 octane (which is not ubiquitous or easily obtained in certain cities/areas) and requires 91 octane. Whereas the RDX recommends 91 octane and requires at least 87 octane.
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Old 01-09-2019, 03:40 PM
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I'm thinking about using Premium 91 (highest in CA) for the first 1k miles then switching over to 87 (regular grade).
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Old 01-09-2019, 04:50 PM
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since I don't drive much, I live in NYC and take bus to work. I drive only during weekend, holiday and vocation. It is about 500 miles a month. The cost difference between premium and plus for 500 miles a month is probably $10 a month, so I go for premium as recommended.
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Old 01-09-2019, 06:20 PM
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Originally Posted by jesser916 View Post
I'm thinking about using Premium 91 (highest in CA) for the first 1k miles then switching over to 87 (regular grade).
Why? You gain nothing by doing this.
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Old 01-10-2019, 06:46 PM
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Originally Posted by securityguy View Post
Why? You gain nothing by doing this.
during break-in period. Probably won't make a difference but that's what I was thinking about doing.
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Old 01-10-2019, 07:45 PM
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Originally Posted by securityguy View Post
Why? You gain nothing by doing this.
Save money?
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Old 01-10-2019, 08:03 PM
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Originally Posted by Yotrek View Post
Save money?
You totally missed the point of the comment Yotrek !!! Why use 91 for the first 1K miles and then switch to 87??? What's the purpose of using 91 at all in this instance? Breaking in an engine with 91 will be no different than breaking it in with 87. You get it now?
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Old 01-10-2019, 08:12 PM
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Another gas thread...... Listening to advices from a sales guy?
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Old 01-10-2019, 08:21 PM
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Originally Posted by securityguy View Post
You totally missed the point of the comment Yotrek !!! Why use 91 for the first 1K miles and then switch to 87??? What's the purpose of using 91 at all in this instance? Breaking in an engine with 91 will be no different than breaking it in with 87. You get it now?
I get it Securityguy, at the end of the day switching from 91 to 87 nothing more than trying to save money, no?

Last edited by Yotrek; 01-10-2019 at 08:23 PM.
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Old 01-10-2019, 09:29 PM
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Whatever you do, just don’t do this:

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Old 01-11-2019, 03:26 AM
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Fill her up with distilled water or rubbing alcohol!
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Old 01-11-2019, 03:28 AM
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Better yet, use 10w50 conventional oil, no one uses that stuff anymore so it's cheap as hell, and makes this cool blue smoke when you rev!
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Old 01-11-2019, 04:21 AM
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Since you're not supposed to give the engine full throttle during the break-in period (600 miles) per Acura, I wonder if using 87 would actually be better? The engine would retard itself and shift sooner so you couldn't get that high up in the revs. Cheap Insurance! Cheap gas and you protect the engine from getting up to redline haha.
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Old 01-11-2019, 06:11 AM
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Originally Posted by Yotrek View Post

I get it Securityguy, at the end of the day switching from 91 to 87 nothing more than trying to save money, no?


Yes...switching does save money but what are your thoughts on using 91 for the first 1K miles and then switching to 87 which was the real question as this is not about money. Will it make any difference in the longevity or wear of your engine to use 91-93 for the first 1K miles??? That's the point you are missing.
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Old 01-11-2019, 12:04 PM
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Originally Posted by securityguy View Post
You totally missed the point of the comment Yotrek !!! Why use 91 for the first 1K miles and then switch to 87??? What's the purpose of using 91 at all in this instance? Breaking in an engine with 91 will be no different than breaking it in with 87. You get it now?
yea I wasn't sure. I was just thinking about it. I'm still on my first gas tank from the dealer. Thanks for the advice!
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Old 01-11-2019, 01:04 PM
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So the actual wording in the manual recommends 91, but does not require?

If it was my car, it would be getting 91 for optimal power. If cost of premium is an issue, Id be looking to buy a cheaper car.
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Old 01-11-2019, 01:55 PM
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Originally Posted by russianDude View Post
So the actual wording in the manual recommends 91, but does not require?

If it was my car, it would be getting 91 for optimal power. If cost of premium is an issue, Id be looking to buy a cheaper car.
Yes 'Recommended' not 'Required'.

What are you going to with optimal power? Race it?

Cost isn't an issue man. Go have some coffee and have a good day lol
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Old 01-11-2019, 02:50 PM
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Originally Posted by russianDude View Post
So the actual wording in the manual recommends 91, but does not require?

If it was my car, it would be getting 91 for optimal power. If cost of premium is an issue, Id be looking to buy a cheaper car.
Look at the AAA study. In regular driving they saw essentially no difference with usable power at 91 octane. Under WOT, the performance car (Mustang) saw a small % increase but the much higher increase in cost of the fuel means mathematically it is not a proportional increase/value-proposition.

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Old 01-11-2019, 02:58 PM
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Honda makes it easy for us by having a very similar 2.0L engine with 10 AT supplied in their other vehicles. Look at the recommendation for 87 in those vehicles and the quoted power rating and that's your answer on what you're losing by not using 91. The tuning companies already showed that the Accord put out a few more HP stock just by using 91. Again, this is all just marketing by Acura to make people feel like they are driving a special luxury car and can quote slightly higher power figures to differentiate themselves from Honda since they are testing the vehicle with 91 vs 87 in the Hondas. Whether the HP bump for the added fuel cost is worth it is up to you. The test below was done with 93 vs 87 octane fuel.

http://www.ktuner.com/dyno/AccordX/2L/93vs87Stock.png
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Old 01-11-2019, 08:43 PM
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I like to do ďspiritedĒ driving sometimes. If car would feel a bit less responsive with 87 - I personally would not like it. Would be intresting If someone did the compare. Also, on some cars(not saying its true for 2019 rdx) you acutually get worse MPG if you go with octane that is bellow recommended. When I had 2001 CLS, it would get worse milage when running on regular, so at the end of the day it would not even benefit me financially to run regular gas.

Do we have any stats on MPG with 87 vs 91 or higher? Is it exactly the same?

Last edited by russianDude; 01-11-2019 at 08:45 PM.
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Old 01-11-2019, 09:25 PM
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Fwiw. Iíve owned several vehicles over the years that recommend premium. I did several unscientific tests to see if premium was giving me better performance or fuel economy. The results were the same every time. Zero difference. I would gladly pay the extra money for premium if I had achieved the results. Itís not about saving money for me but why waste it. Having said that, Iíve yet to test the Rdx, in the meantime, mid grade.
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Old 01-11-2019, 09:50 PM
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Maybe it’s something new with “recommended” vs “required”. 1st gen rdx has 91 or higher as “required” and also has a warning that prolonged use of lower octane may cause damage to the engine. I only ran 87 once in 1st gen rdx and the performance was bad, Maybe in newer cars it’s less important.
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Old 01-12-2019, 12:07 AM
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Old 01-12-2019, 08:11 AM
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Video shows that premium gives better mpg and higher HP in most cars tested.
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Old 01-12-2019, 08:49 AM
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I like the conclusion of the video that says you should evaluate for yourself if you notice any difference in power or knock. My personal opnion, I am still getting premium. In costco its 0.30 more for premium vs regular. With decreased MPG (even if its 2%) and loss of few HPs its not a big deal for me to pay 0.30 more per gallon to get optimal performance. Engines do run a bit cleaner with premium gas too.

Last edited by russianDude; 01-12-2019 at 08:52 AM.
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Old 01-12-2019, 09:15 AM
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Originally Posted by russianDude View Post
I like the conclusion of the video that says you should evaluate for yourself if you notice any difference in power or knock. My personal opnion, I am still getting premium. In costco its 0.30 more for premium vs regular. With decreased MPG (even if its 2%) and loss of few HPs its not a big deal for me to pay 0.30 more per gallon to get optimal performance. Engines do run a bit cleaner with premium gas too.
Finally something we both can agree on
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