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MetroMPG, i am logging using a home made fuel consumption meter. It uses the same principle as the MPguino by measuring off the injector pulses.
The logging is done by the fuel consumption meter which logs straight to a USB thumb drive when one is plugged in. It writes a new line to a file every second with the duration of the injector being on in that last second along with the speed of the car.
It would be very easy for the MPguino to send out this information out of a serial port if others want to log a trip. Alternatively i believe logging to a flash card is fairly easy.
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