For the ultimate purpose of saving money, is it better to fill up a car’s fuel tank, or only buy enough to bring up to 3/4 or 1/2, etc?
The reasoning presented to me was that the additional fuel was extra weight that reduced the gas mileage. That’s true, but I’m not so sure it’s significant. Any ideas on what the answer is?
One also needs to account for the costs of the extra stops to buy fuel, but it’s not obvious to me how to quantify those.