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Re: fuel economy calculation
Posted by Joe Dille (more from Joe Dille) on Sat, 23 Sep 2000 09:49:30
In Reply to: fuel economy calculation, Tom Reingold, Sat, 23 Sep 2000 01:05:58 
Tom,

Very interesting.  The car's computer has to calculate the miles and 
gallons, then divide the two.  The miles it can calculate very easily.  It is 
also the same miles that you use for your calculation.  The gallons is the 
difficult part.  The fuel injection computer has to figure out how much fuel is 
injected per squirt and add them up.  The fuel meter at the gas pump is 
much more accurate.  If the fuel injection calculation is off by just a little the 
calculated fuel consumption is off.

FWIW, my Dodge reports the fuel consumption as about 0.2 mpg low.

In general the calculated consumption will be different by a fixed 
percentage.  You can add a percentage to your displayed consumption.

Drive Safe,

Joe
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