Refilled with non-ethanol 91 octane ...

[baseballfan416]

The way it's been explained to me, AND PLEASE!

Correct me if I'm wrong but...

Higher octane burns faster. Our cars are designed for a slower burn (hence, the reason most people don't see much benefit with higher octane). Yes, the compression is somewhat high for our cars, but the timing (primarily at higher rpms) is way too low for what it could/should be, and won't take advantage of a potentially quicker burn.

Meanwhile, the corn free aspect is of benefit because it burns at a lower temp.

Combine the two factors and it's basically a wash... If you could actually get corn free 87, it'd help because it'd be a slow burn as well as a cooler burn.

[jambo101]

Originally Posted by baseballfan416

Correct me if I'm wrong but...

Higher octane burns faster. Our cars are designed for a slower burn (hence, the reason most people don't see much benefit with higher octane). Yes, the compression is somewhat high for our cars, but the timing (primarily at higher rpms) is way too low for what it could/should be, and won't take advantage of a potentially quicker burn.

Meanwhile, the corn free aspect is of benefit because it burns at a lower temp.

Combine the two factors and it's basically a wash... If you could actually get corn free 87, it'd help because it'd be a slow burn as well as a cooler burn.

Actually Higher octane gasoline burn slower than regular grade gasoline, i'll leave you to do the research..
As the car is designed with economy as one of its main features the engineers who built the engine specify in the owners manual which gasoline to use for optimum performance in the engine they engineered.
Those thinking higher than needed octane levels are going to increase mileage and power have fallen into a very old marketing scheme/gimmick whereby the petroleum manufacturer gives the impression that the higher octane is a measure of quality instead of detonation characteristics,nice trick as many people go out and fill their cars with unneeded higher octane fuels and the fuel company laughs all the way to the bank.
http://www.handymanusa.com/articles/octane.html