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Originally Posted by xnsf
the topic changed?
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This would hold true on a flat road--stretch out a length of ribbon 3 foot long and pretend it is a road--then put some gentle curves in it and measure it--it got shorter if measured on a straight line--this is what the GPS sees--if you are in hills the car OBC measures actual surface distance traveled up and down the hills--the GPS sees a coordinate location by triangulating two locations from the satellite and will usually show shorter distance. I noticed this with my portable Garmin in 2 different cars--the Garman always posted less miles. And again using the gallons shown on the gas pump is very inaccurate as stated in my last post--no two pumps are the same on shutoff levels--can vary up to 1 gallon--and who knows the accuracy of the pump flow meter itself. Although automakers may fudge the parameters in their favor slightly--the fact still remains that the flow meter and OBC will be very consistent compared to reading gas pumps. Happy motoring
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...has nothing to do with K&N filters. Hence, "

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