MPGuino is a great Arduino/AVR based fuel trip computer that calculates mileage by directly reading fuel injector pulses and vehicle speed pulses. Great for pre-OBDII cars, and more accurate than OBDII-based trip computers.
A system for tracking trip data on an ESP32
The Vehicle Fleet Text File Reader Program (C++) uses a loop to read a file named FleetInput.txt, which holds vehicle ID, miles, and gallons space delimited on each row. Then, the program calculates the fleet average and individual average miles per gallon (MPG), displaying the results in the console are tabular output.
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