Hey guys, just wondering about this. I know our tsx are suppose to be filled up with premium (or so it says it should) im just wondering if using 91 or 93 is a big difference. I just got my car and my first fill up, I gave my baby 91 cause thats the highest they had at that gas station. I know theres a Chevron that has a gas above 91

 

This is from that little book that everybody gets with the car but nobody ever reads.

Fuel Information
■ Fuel recommendation
Unleaded premium gasoline, pump octane number 91 or higher.
■ Top tier detergent gasoline
Because the level of detergency and additives in gasoline vary in the market, Acura endorses the use of “TOP TIER Detergent Gasoline” where available to help
maintain the performance and reliability of your vehicle. TOP TIER Detergent Gasoline meets a new gasoline standard jointly established by leading automotive manufacturers to meet the needs of today’s advanced engines. Qualifying gasoline retailers will, in most cases, identify their gasoline as having met
“TOP TIER Detergent Gasoline” standards at the retail location. This fuel is guaranteed to contain the proper level of detergent additives and be free of metallic
additives. The proper level of detergent additives, and absence of harmful metallic additives in gasoline, help avoid build-up of deposits in your engine and emission control system. For more information on top tier gasoline, visit www.toptiergas.com.

 

91 is fine. ceb is going to get an aneurysm because this has been covered before if you used the search function to look for the answer. anything higher than 91 is a waste for our car.

 

im surprised no one has gone on a rant about using the search functionality

 

I get 92, so that seems like a good compromise.

In all seriousness, most of the stations around me, their Premium is 92 so I end up with that.

 

It's mapped to run on 91 minimum and with timing advanced as far as possible. If you go from 93/92 to 91 it's not going to pull timing (it probably will if you go to 85 octane to help keep from pinging/knocking; i.e., the knock sensors will retard timing.)

Anything over the 91 minimum is a complete waste of money. It will not do anything for the motor unless you get a tune that will actually maximize using higher octane (run more timing.)

But if you feel better using higher octane, then more power to you (but not to your motor.)

 

Sorry my fault guys..

 

I use regular so 91 should be fine

 

i use 93 like others say to them it seems like a waste of money but i tested it out for myself and i get better mileage out of the 93. 91 burns quicker and i feel a differnece either way an extra 8 - 15 cents isnt saving much so why not run 93

 

did you drive in the exact same conditions in both runs? exactly the same speeds and traffic and everything? i mean unless u did that, your results are pretty ymmv. i remember ceb posted a link a while back with proven scientific data/tests that getting a higher octane gas did nothing for gas mileage and in some cases could even produce worse results.

 

Heh, that could mean that the car was able to advance timing more using 93. Wish I had 93 octane to try it out, if I ever run into it I will.

Though if 93 didn't have ethanol in it and 91 did, that would explain your mileage gain. I'd be tempted to run non-ethanol gas vs. gas with ethanol in it, no matter if it was 91 or 93 (granted all the options were premium).

Stan

 

anyone ran race gas on the tsx before? haha

 

I always pump 93, but if there really isn't a difference between 93 and 91, then I rather not pay $4.09 a gallon.

 

yes i did to the best of my abilities and i saw differences, and to me paying an extra .10 - .15 a gallon is not a big deal your not saving much an extra half a gallon at full up if anything seems pointless to me

 

im using iseeyoutwo's 4.09(93) gas price lol :-p to fill up from e will be $75.66
(91)3.94 - .15 cheaper fill up from e will be $72.89 so all you would be saving is $2.77 each fill up not much of a help in my eyes since its only a little over half a gallon. so to each his own, to me if i wanted to skimp on gas i would of kept a civic with a d15 in it

 

But the fact is, you're not skimping on gas. You're simply using something that's more than required and not necessary. It's like buying more expensive soap that has nice smelling additives rather than choosing which actually cleans well.

Better gas mileage from 93 over 91 is in one's mind, sorry. There's no technical reason why one will get better mpg. The timing remains the same and the fuel is burned identically. The TSX motor is designed to run properly on 91 octane without any needed timing changes.

And $2.77 per fill up can be of value for someone commuting 50+ miles plus per day.

But sure, do what makes you feel better. No problem there. That's 95% of why consumers make the choices that they make everyday, and why advertising is so incredibly effective.

 

With the fancy soap you're at least getting something in return, but with 93 you are getting absolutely nothing in return.

The article that was referred to earlier had this quote regarding a test of regular vs premium fuel:

"The Accord took a tiny step backward in power (minus 2.6 percent) and performance (minus 1.5 percent) on premium fuel, a phenomenon for which none of the experts we consulted could offer an explanation"

They concluded with:

"Our tests confirm that for most cars there is no compelling reason to buy more expensive fuel than the factory recommends, as any performance gain realized will surely be far less than the percentage hike in price."

That clearly negates all of the non-scientific tests by forum members that claim any noticeable increases in either power or mileage when using 93 vs 91.

 

Like I said "to each his own!" ill continue to run my 93 like i said TO ME i feel a difference if you want to say its in my own mind then it will be in my own mind lol. and for the commuting for 50+ miles your bound to hit traffic so that half of gallon wont even be seen, if your that cheap that 2.77 savings on a fill up
will make a world of difference then you should just take public transit .

MY OPINION ( there like assholes everyone has one ) pce

93 above all

 

I was going to a station near me for a while that had both 91 and 93. I ran 91 for a few fill ups, got close to E each time, and then tried 93 for a few. I kept my commute exactly the same, etc., and I did notice a slight increase in MPG (and the car did feel just a tiny bit more responsive). The MPG increase was nothing too dramatic, but enough that I don't feel like I am completely throwing money away every now and again when I choose to use 93.

 

Thank you but its in our heads and i had a b5 s4 with apr stage 3 putting down 420awhp tuned for 93 octane with the map for 91 it only puts down 380awhp but thats in my head also 93 does completly nothing for your car

 

the only way to tell is to monitor knock.

on the TL side we have observed knock and found a mixture of 100 octane with 93 to make 96 octane completely stop knock.
but 91 and or 93 is completely acceptable(there is no audible knock with 93)

 

my sunoco offers 100 octane race fuel, i love that its there but dont use it =P i'll stick to 93

 

^next time i head to the track I'll pump a few gallons of 100.

 

91 is the way to go

 

I see BP isn't on that list. The only option I have right by my house is BP and Shell but the Shell station is outdated and small so it's difficult to get in there without waiting. Is it going to make much of a difference if I use BP over Shell? I've always thought BP was good until I saw that list.

 

Oh, okay. That makes a lot of sense.

When you get a bit older and wiser, and have to take care of yourself on your own dime, you might think differently.

That's utterly meaningless in respect to this thread. But then again, it also only confirms exactly what I have been saying about octane and motor mapping.

Gain some maturity, car ownership experience, and better language skills, and then come back later for another try at making worthwhile contributions.

I feel like I've wandered onto a high school playground.

 

I dare you to go into the 3G TL section.

 

oh justin...u belong here! not there!

 

Initially, when I first purchased the car, I was using 93 octane which contained 10% ethanol. . The car ran great and I felt the mileage was decent.
Recently, a few stations in my area have begun selling non ethanol 91 octane, so I figured I'd try it out to see if I noticed any difference. The car continued to run fine with 91, and I noticed no appreciable changes in performance, either positive or negative. I did, however, notice a decent increase in overall miles per tank. That's OK in my book...

 

^^Makes total sense. I so wish we had some gas without ethanol in it somewhere nearby so I can see what difference in mileage it makes -- as-is this car is returning awesome mileage to me so far, want to see how much better it can be.

We are paying $4.60/gallon for 91 (with 15% ethanol in it, too) btw, prices went up in the past week. After driving an 18MPG Subaru for the past 5 years, the TSX's mileage is very noticeable in a pleasant way.

Stan

 

Does anyone here feel the difference between different brands?
In my case, I see noticeable difference. For some reason, the unknown name XtraMart Fuel given me best mileage as well as good acceleration while Hess is far worse. I've tried Mobile many times and BP few times, they were just average, nothing good, nothing bad. I haven't tried Shell yet, should do.
Btw, in my area, they're all 93 rate.

 

When i get older and wiser. Really , and to take care of myself on my own dime get real were on the internet. You do not know me as nor do i know you, i have been taking care of myself since I've been 15 now im 23 with my son and a house in an amazing neighborhood. If you felt some type of way about my comment towards taking the public tranist it sounds like a personal problem

I have maturity and car ownership experience. Language skills thats a great comeback i didnt know we were in an english class.

And by the way you contradicted yourself stating that you get no difference in 91 - 93 then said unless its been tuned for it. So wouldnt that mean that there is a difference between the two? ill let you sit there and figure it out peace

 

^language skills are needed.

 

oh your a funny guy , good for you last i seen i wasn't speaking to you hop off my dick

 

^better come backs are needed, breaux.

 

$4.60/gal?! Try $3.70ish here for premium. Here we don't have 91 just 93. So I always said anything 91+ is good, even though there's a point of wasting money. When I was in Orlando at a 7-11 I was completely confused as to why they had both 91 and 93 octanes. I believe you had like 6 choices 87, 88, 89, 91, 92, and 93. I was like wtf.... I'm used to seeing 87, 89, 93 (sometimes 91). So I can understand why the majority of cars that recommend/require premium are tuned to run off of 91+ since octane varies by region.

BTW let's get along guys.:gheyhug:

 

No need for comebacks your beyond a waste of my time. I gave my opinion if you don't like it keep your mouth shut and move on

 

no, that wasnt a come back either.....
please, try again!

 

ill leave you and your 27,255 posts to talk to yourself

 

I was getting about 520 miles per tank of 93 octane with 10% EtOH. I'm getting about 560 with the non-EtOH 91 octane. With my last tank of 91, I had 567 miles on it when I pulled into the gas station, and my range said 49 miles. It would have been interesting to see if I could have hit 600+ miles per tank. It's hard to do when this car is so much damn fun to drive.