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ok, so not exactly instant mpg, but i did find a simple method of logging my data, then later putting that data into excel.
the example given on converting maf and vss into mpg is in reference to a gasoline engine running at 14.7?% air/fuel ratio. The ratio for diesel to air is not necessarily constant, which should account for part of the inaccuracy of the mpg number i am calculating.
Comes out to an average of about 25 mpg....i would like to think this number if off by at least a factor of 2.
I should be able to fill up sometime in the next week so i will be able to figure my actual fuel economy. Then perhaps i can edit my formula to better reflect actual mpg numbers. Once i get the formula *calibrated* I will be happy.
Does scangauge use vss and maf to calculate mpg on all vehicles, including a tdi?
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