<VV> GPS to measure MPG

[FrankCB at aol.com]

Indicating INSTANTANEOUS miles per gallon is  useless on normal roads.  It 
might make sense on a dyno under lab  conditions, but the value changes 
constantly under real driving  conditions.  We had a 89 Beretta with an electronic 
dash that could display  instant MPG or average MPG.  The instant MPG varied 
continuously everytime  the road changed slightly even with a constant accelerator 
position.  The  AVERAGE MPG was much more useful on a longer trip.
    If your GPS unit indicates miles traveled from  the time of your last 
fullup, and you noted the amount of fuel taken on the  refill, then the math 
involved is simple enough for a grade school kid with a $5  calculator.
    Frank "calculatingly" Burkhard
 
 
In a message dated 7/15/2008 12:48:21 PM Eastern Daylight Time,  
crawfordrose at msn.com writes:

Well, my  GPS doesn't calculate MPG for me even though if I took the time and 
effort I  might be able to do the math.  Maybe that's a software feature we 
could  recommend to Garmin.
Crawford







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