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Old 10-19-2011, 10:50 AM   #6 (permalink)
California98Civic
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,299

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Quote:
Originally Posted by PaleMelanesian View Post
Right. 65 vs 70 sidewall almost covers the difference. I always assumed the 14's would have a close-to-accurate speedometer due to the slightly bigger tire.

Are you reading the speedometer mph or odometer miles? They're not always the same.
I'm reading the speedometer. It seems 2.5 mph HIGHER than actual speed (not percent but a consistent number of miles per hour, regardless of speed). The ODO I tried to calibrate against Google maps and found a 0.2%-0.4% UNDERcount by the ODO, but I think that test hopelessly flawed because the route was very very hilly and only 11 miles long. Later this month I try again with google maps, a good GPS that gauges altitude, and a 69.2 mile route that is fairly flat.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



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