For fuel consumption you would need to be able to read the fuel level in the tank...although the other features that don't involve knowing how much gas you have could be doable...
For the Miles until empty, you could have the calculation based on the previous fill up. You would have to poll the speed every few seconds, calculate the distance traveled to get total miles driven on that tank, then subtract that number from the total from the last MPG number from the previous tank.



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