i got 30 using cruise control, going about 74... punched the reset when i hit speed and was going for about 20 mins, i thought it was pretty good anyways
Of course I was coasting down the side of a mountain in Tennessee when I reset it...
I don't really trust the mpg reading on the display, too many factors can easily throw it off. I just do the old "fill her up, drive, then fill her up again and do the math" trick. The best I've seen is 31 mpg (all flat highway driving in Florida with cruise set at 75 mph)
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