For those of you that have 10% ethanol blended fuels and non-blended available (like me) have you noticed any performance or MPG difference between the two in your GTs? I've been using only the 10% blend, which is by far the most commonly available here in my '06 since new but plan to give some "100% pure gas" as try as soon as I run it down close to empty.

Just wondering if anyone has done a comparison.

 

I've run a couple tankfulls of ethanol-free 93 through the car. It actually does seem to run differently; a slight but noticable gain in low-mid speed throttle response and power. MPG test results run on the same course at a steady 70 MPH show a 1 MPG gain over the 10% blended stuff.

 

I wish I could comment on this but all I have is the 100% proof down where I am now. I did get some gas in my brother's car when I drove it back from Ellsworth, SD but I did not notice a difference. That was however, only one tank among many on that trip.

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