hhmm lets see if i understand :nanana:

our hand held GPS says we've traveled 100 miles and the OBC says 105 = OBC correct

our hand held calculator says 20 MPG calculated by using OBC provided miles divided by gals provided by pump, OBC says 21.5 MPG = OBC correct

these calculations have been made for every (almost) tank of gas for 40000 miles = OBC correct

ab

we paid $48.00 (US) 3 years ago.

ab

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

:hijack:

HUH???? :confused:

the topic changed?

This:


...has nothing to do with K&N filters. Hence, ":hijack:"

I have one in my '04 3.0, with no noticeable increase in intake honk. I got it for $39 online somewhere. I've been using K&N's on bikes and cars since the mid-70's. My experience has been that they do help MPG slightly ( ~.5 - 1.5%). I've also had Autothority CAI rigs (with conical K&N filters) on an '87 325is and a '96 328is and both were good for +1-2 mpg, better throttle response, a lovely intake noise, and a small seat-of-the-pants performance gain. YMMV

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