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Old 02-26-2008, 10:24 PM   #4 (permalink)
Green Machine
EcoModding Lurker
Join Date: Jan 2008
Posts: 14

Green Machine - '05 Chevrolet Aveo
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I used mile markers to check my GPS. Get up to a GPS reading of 60 mph and time yourself between markers. If it takes one minute from marker to marker, it's more or less accurate.
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