This could be a big factor (20-30% reduction), although there might be some technical issues with the engine itself. I'm not convinced the overall environmental and economic impact of corn ethanol is as positive as the govt. and GM are publicizing anyway. Maybe cellulosic ethanol will change that. I probably wouldn't buy E85 even if I could get it, but that's just my opinion.SEL said:I am curious if GM did not make the 3.6L engine E85 capable because they were concerned with any additional mpg drop related to E85.