I have tried to do this with other vehicles. The hardest part is not having the "game guage" to give you instantaneous feedback.
I don't drive our other vehicle (a minivan) enough to go through a whole tank of gas myself. My wife drive it most of the time. So trying to tell how much influence I'm having is very difficult to measure.
My sister in law has a minivan that actually has an instantaneous mpg readout mounted just above the rearview mirror. Someday I'd like to drive it to see what kind of mpg I can get out of it.
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