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I get as low as 8.5 mpg at 82 mph with some wind and as high as 14.5 mpg at 60 mph driving easy and trying to get good MPG on flat ground.

I have 37" tires, 4.88 gears, roof rack. Usually its in the 11-12 mpg range.

These are all figured on the highway. In town probably about 11 mpg. I actually coast as much as possible but tend to accelerate hard.
 

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Are you correcting for the huge (>15%) speedometer and odometer errors resulting from the 37" tires ??

If not, your indicated 82 MPH is actually closer to 95 MPH ... takes a LOT of HP to make a brick fly at 95 MPH.
Yeah I have a speedometer calibrator to match the speedo with the GPS speed on my phone and tablet. How that effects the odometer I'm not 100% sure.
 
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