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On 7 Jun 2005 at 11:50, vwfye wrote: > actually, i check my mileage via mile markers on trips like that. i > also do the conversions on the odometer to actual mileage in my > cars... Okay, that's a reasonable way to do it, but even measuring over 4 miles would not be very accurate, (~2.5%.) If you try to do this over just a single mile you could be off by 10%. I'm assuming that you have odometers that read to tenths of a mile, but the early cars only go to the nearest mile, so this would be very hard to measure, resulting in more room for error. > for example, my wife's car reads 1 mile for every 1.1 travelled... so > we do the conversion for her mileage as Yx1.1=mpg on my pink notch it > is Yx.92=mpg Without looking at tire charts your .92 seems reasonable, but I have to wonder how your wife's car could be 1.1. That's a huge discrepancy for a car that I assume has stock tires. What size tires do the 2 of you have on the LF wheels? > so yes, my 30-34 is acurate! now here is the weird thing... it got > the 34mpg traveling at my highest sustained speed average. that was > very unexpected! Sometimes we mislead ourselves when we overlook other factors. It doesn't take much of a downhill or tail wind to make a very big difference. Coming back from Parma a couple of years ago I was getting GREAT mileage all along the way. Dave was the one who pointed out that this part of the trip amounted to about 1000 miles of downhill with a tailwind. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~