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Old 03-30-2013, 10:48 AM   #2 (permalink)
EcoModding Lurker
Join Date: Mar 2013
Location: Arizona @ 5000'
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Grey - '01 Hyundai Accent GL
90 day: 35.55 mpg (US)

Big Red - '06 Mitsubishi Eclipse GS
90 day: 31.57 mpg (US)

Roller-Skate - '86 Pontiac Fiero
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UG recommends ≥ 3 miles and speeds of 50 mph or greater when covering the distance for it's calibration.

I consider this question timely, and forgive me for hijacking the thread.

How accurate are the mileage posts on US highways? If no mileage markers are available is GPS accurate enough? Would measuring the calibration distance using my cycling computer (Garmin 500 with speed and cadence sensor) give better results than either of the prior 2 questions?

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