Quote:
Originally Posted by COcyclist
I just filled up last night and I have kept written records of miles and fuel used since I got the car. I have a ScanGuage II and it showed a 854 mile tank. The VW odometer showed only 836 miles since the last fill-up. I calibrated the SGII to the highway mile markers to get an accurate mph reading. Most VW owners report the speedometer is about 3 mph higher than actual speed. I have since gotten a GPS and just wondered what would be MOST accurate: odometer, SGII or GPS? I could leave the GPS in the car and only reset the trip feature at fill-up to get miles per tank. Would this give me more accuracy than either of the other two?
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I calibrated my odometers using my GPS. Cars were about as dead on as you could get; truck was +4.5% due to the bigger tires. I add 4.5% to my "miles travelled" when putting tanks into the garage.