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Date:         Mon, 3 Sep 2007 20:25:16 -0400
Reply-To:     Wesley Pegden <wes@CS.UCHICAGO.EDU>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Wesley Pegden <wes@CS.UCHICAGO.EDU>
Subject:      Re: MPG
Comments: To: Kim Brennan <kimbrennan@mac.com>
In-Reply-To:  <85DB3E54-82D3-48E3-81F4-841B9AAC28C1@mac.com>
Content-Type: text/plain; charset=ISO-8859-1

Good info, I wasn't aware of the difference between speedometer error and odometer error... my speedo needle bounces too much for me to tell what it's real error is ;)

In any case, it's the error on the odometer that matters for calculating mpg.

-Wes

Kim Brennan wrote: > You haven't even begun to touch on this topic with this little sentence. > > On Sep 3, 2007, at 6:43 PM, Wesley Pegden wrote: > >> One thing to keep in mind is that many speedometers read a little fast. >> You should compare your trip odometer to highway mileage markers to see >> what factor it's off by to correct your numbers. > > The US Standard is that speedometers read 3-5% below actual speed. But > odometers should be 1% or less from actual. But all that is moot once > you start going away from stock tires. And if you have gone with > larger wheels your figures can be all over the map. > > In my case. I have one syncro, where the SPEEDOMETER reads pretty much > 10% low with the tires on it (when it says you are at 50 mph, you are > actually at 55mph.) The ODOMETER, on the other paw is 7% off. When it > says you have traveled 200 miles you have actually traveled 214 miles. > > In another van, the numbers are different. And the tire sizes are > different. In that van the speedometer is 12% off, and the odometer is > 8% off. > > Just because you have calculated the margin of error for your ODOMETER > doesn't mean you have calculated the margin of error for your > SPEEDOMETER. > > My calculations of margin of error are based on GPS values for speed > and distance. >


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