I have a secondary idea that I thought would be neat. I find myself watching my gallons per hour a lot during accelerations, with my goal of being under .7 or .8 gph. I was thinking the same idea only with gallons per hour would also be very useful, since I have noticed that accelerating more slowly is helping take the edge off the cooler weather. It's a great idea, I haven't tried anything with it yet either, but thought it would be easy enough if I wasn't able to get the hang of the sound my car makes around .8 gph.
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