Author Topic: MPG calculation on tdi  (Read 4748 times)

Offline buznee

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MPG calculation on tdi
« on: May 18, 2012, 07:42:44 PM »
I was curious as how the ultragauge calculates the fuel portion of the mpg calculation for a older ALH tdi engine on a 2000 jetta which is not equipped with electronic fuel injection, therefore no measurement of fuel duty cycle on injectors. Diesels from what I've read run at a variable air fuel ratio ranging from 15:1 to 50:1 therefore using the MAF with an assumed air fuel ratio would provide inaccurate mpg values. There is also a MAP sensor but not sure how that would help with providing more accurate mpg.  ???