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Old 12-02-2013, 09:06 PM   #17 (permalink)
gone-ot
...beats walking...
 
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Simply:

a) assume A/F-ratio of 14.7:1 (closed-loop ECM);
b) measure Air flow from MAF or MAP sensor;
c) backsolve for GALS/time;
d) and divide: MPG = (MILES/time)/(GALS/time)
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