87 vs 89 vs 91 octane tune
02-11-2010, 03:44 PM
#21
6th Gear Member
Join Date: Nov 2008
Location: RI
Posts: 5,453
Can't the 10% ethanol in gas result in a drop in mpg in a performance tune? I don't use the 93 octane tune in my diablo because when I switched to it I saw a big drop in mpg, never figured out what it was. It was the performance tune, but it was awful mileage.
02-13-2010, 05:41 PM
#22
Join Date: May 2009
Location: Nevada
Posts: 11
I am going to expand on that. Also stay away from the big name stations that have 10% ethanol if you are going for MPG's. For example, Pilot gas stations have ethanol in them. Ethanol will reduce your MPG's in my experience. I usually stick with Chevron or Texaco personally. Unless I am on a Military Base.
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