There's been a ton of debate on the forum with people all around world on which is the best fuel to use in our engine under different types of climate. Just wondering which brand and octane rating are my buddies here in Toronto uses. Which one you do use and which one seems to run the best from your experience?

I like Shell - 89.

 

I mostly use Esso 91 or Petro-Canada 91. Once in a while I will put the 94 Senoco stuff in there.

 

Sunoco 94. My car has not drinken anything else since my purchase back in july of 03

 

If you'd like some facts to base your decision on, here are the latest numbers on how much crap is in your local gasoline -

Can Fed Sulphur Report....

Pick your local supplier, and check out whether you are buying your dino juice from a state-of-the-art refinery or from "Fred Flintstones' Gasoline Inc!"

(My refinery has been in the lead for the last twenty years, looks like some others are catching up....slowly! )

S

 

Never lower than 94.............

 

I run 94

 

Sunoco Ultra 94 only for me too!

 

Wow I didn't know Ultra 94 is so popular amongst our gang. Anyone here uses 87 like a lot of neighbours down south ?

 

usually i run 91... every once and a while i'll ad an additive octane booster

 

All types of Sunoco fuels, did u guys realize the higher octane u buy the faster and smoother u burn and it burns your money as well.

So thats why I use 91 most of the time

 

I run Shell 87 in the winter's and Shell 91 in the summers. No special reason for Shell, just personal preference, maybe because they are affiliated with Ferrari, hahahaa...

 

Sunoco 94 since purchase.

 

can you tell any difference running 87 vs 91 ? most people in the states say they cannot feel any difference in performance

 

Being high compression engines, you will have a higher probability of pinging with a lower octane gas.

Your PCM will automatically adjust ignition timing and you will see decreases in power. To some, the butt dyno may not detect it but in actuality... you are seeing a decrease in power....even if it is slightly

The octane of the gas does change the actual power output of the engine... but the higher octane prevents detonation.... and in turn the PCM can adjust settings for optimal power.. This is evident in most high compression or turbo'ed cars..

 

Actually the reason you need to run a higher Octane fuel in a rotary is because of your oil metering pump. The oil you are putting into the engine to lubricate the apex seals lowers the Octane level of your fuel. Rotaries will run fine on 87 however when you add the oil into that equation you lower the octane rating by at least 2-3, ergo your 91 Octane is acting like 86-87 in a piston engine.

 

Good timing for your question Smoker!

I just switched back to Shell 91 yesterday and I find that the engine revs up more smoothly when you drive it hard, as opposed to Shell 87 (or any regular I guess). In the city with traffic, you might not notice it so much. Raw performance wise I don't think 91 makes the car run faster or anything like that.

 

Very Interesting.... all very interesting findings.

I'm thinking about start using Shell 91 exclusively. Given the current price of the gasoline, in terms of percentage that extra $0.10 is not that significant of a premium as before.