MPG calculator versus hand calculations

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P40hawk
Posts: 11
Joined: Tue Aug 04, 2015 11:13 am
Model Year: 2014
Location: Wichita, Kansas

Re: MPG calculator versus hand calculations

Post by P40hawk » Thu Jan 04, 2018 7:48 pm

Low_Sky wrote:
Thu Jan 04, 2018 12:47 pm
My 2015's lie-o-meter is accurate for highway miles. Where it goes off is in city driving, and paints a rosier picture than reality. In city driving, the truck calculates about 0.5 to 1 mpg better than hand calculations. My guess is that the sample rate of whatever sensor is measuring fuel flow is too slow to catch the spikes that occur during acceleration in city driving. Highway driving is a nice steady condition, easy to measure accurately.
I agree, it must be something along those lines. Glad I'm not the only one noticing this.

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