I use an app. Quick and easy. Name Mileage, in the play store for free. I just use the fuel part, but you can also add vehicle expenses to get your cpm.
2011 extended, from day 1 with almost 76k miles overall average is 19.65. Best is 23.72 great tailwind. Worst 13.93 head wind, heavy and running about 71 mph.
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