The specific amount of fuel in the tank is a number that I would think most people wouldn't really care about. Some cars will give you calculated "miles/km til

The specific amount of fuel in the tank is a number that I would think most people wouldn't really care about. Some cars will give you calculated "miles/km till empty" based on average mpg calculations, which is arguably at least a semi-useful metric. My car gives me a vague gauge until I get close to zero, and then it gives me a marginally more accurate countdown from 1.0 gal to zero. I think the reason that most fuel gauges are so vague is that fuel levels rise and fall pretty erratically, which would make a very specific gauge give you bad information at least as often as it would give you good. Fuel levels are usually measured with some type of float, and depending on if you were travelling or parked on an incline the float could register a fairly large swing. In an old Honda I drive once in a while I could see the fuel gauge swing more than 1/8 of a tank depending on what direction I parked it on my sloping driveway (nose down or nose up).