I do have something of a benchmark using the MpGuino gauge. The highway I do the testing on is slightly uphill so at 55 mph, 2200 rpm, using the cruise control I average 24 mpg and the other direction it gets 27 average. 3800 lbs with me in it so any hill really brings down the average. I also want to make a removable top so I am thinking about angling it down toward the rear to see if that helps.
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