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my fuel meter works off the injector signal for fuel amount used.
its done with a custom PCB that i routed at work, runs a MSP430 (free sample from TI).
Logs data to USB by serial comms to a device called a vdrive2 from viniculum. It wouldn't be my first choice for using a USB drive but had one lieing around at work so i made use of it
There are probably microcontollers or specific chips that would interface to a USB drive in a better way if anyone wants to do this for themselves.
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