reading through the thread, it seems that you are forgetting the MPGuino as the computer. same code, a couple of diffrent variables (the same ones that you would have to work out for any other vehicle). now just to get a broad range fuel flow sensor. max rate 6 GPH, maximum low rate of 0.25 GPH. this would give you cruising MPG, what you are really trying to monitor.
speed sensor could be a hall effect monitor on the bach of your speedometer.
more later.
p.s. conductiity with gas? are you NUTS!
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