Originally Posted by
docbert
I had two rentals with Avis last week, apparently both being "connected cars" which meant that the fuel level was automatically recorded on return.
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Are "connected cars" actually measuring fuel tank volume/level or fuel flow/fuel used (over time)?
With the on board fuel electronic systems a transducer in the fuel line is probably measuring fuel flow/totaliser, as that is what gives you the mpg. As a guess they just analyse that data. Nothing to do with volume of fuel in the tank. There will be accumulated errors.
Given the odd shapes of modern fuel tank, measuring the actual fuel volume would be very hard.