It reads from the vehicle speed sensor and counts the injector pulses, by default. I was thinking of adding additional feeds to mine, but for now it gives a lot of combinations of data from those two feeds, such as gallons used, gallons per hour, a digital reading of miles per hour, idle time, instant mpg, average mpg, gallons left in tank (you input tank size in setup), miles left in tank, and a few others.
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