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the real question is, does the payoff from mpg offset the vapor, mileage, and time losses at the pump when you have to go twice as often? Probably only if you have a big tank. My tank (~44.5 liters) holds less than 45 kg of fuel (see density of gasoline) when absolutely full, so approx. 20 kg average mass reduction by only filling it halfway full doesn't make a huge difference.
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