PLEASE HELP ME OUT.

[shepd]

I also used to think higher octane fuel was pointless, and it is *except* in some places, premium fuel is the only fuel without ethanol.

Ethanol is basically filler, so you will get better performance (though less than you'd expect) on a fuel with no ethanol, which nowadays seems to be 91 octane. :( And by performance, most of what I've experienced is better mpg, not acceleration.

[tmontague]

Originally Posted by shepd

I also used to think higher octane fuel was pointless, and it is *except* in some places, premium fuel is the only fuel without ethanol.

Ethanol is basically filler, so you will get better performance (though less than you'd expect) on a fuel with no ethanol, which nowadays seems to be 91 octane. :( And by performance, most of what I've experienced is better mpg, not acceleration.

This. Higher octane in a regular engine only has 1 benefit and that is the absence ethanol which yields better fuel efficiency

[ern-diz]

Originally Posted by tmontague

This. Higher octane in a regular engine only has 1 benefit and that is the absence ethanol which yields better fuel efficiency

Interesting.

I've noticed a dip in mpg since switching to Costco gas from Chevron. It's only been a couple tanks, so I'm going to run a few more before deciding to stick with it, or move back to Chevron. No point in paying less per gallon if you just end up buying more of it.

Found this on another thread...

Originally Posted by eTiMaGo

Theoretically, the only advantage you would have is when you rev the engine at very high RPMs, the ECU could apply a higher spark advance and thus make a little more power... But I have not personally seen any evidence for this...