how does fuel efficiency increase as fuel level decreases?

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There was a post on r/theydidthemath that asked how far a fuel tanker could go if is tank was connected to it’s fuel line, the op also said to keep in mind fuel efficiency increases as the fuel level gets lower, how does that work?

In: Chemistry

6 Answers

Anonymous 0 Comments

The more mass you move the lower the fuel efficiency. For most vehicles this is pretty minimal because you have maybe a 20 gallon tank on the high end. But in the case of a fuel tanker, you’re looking at closer to 3,000 gallons. Going from 3000 down to say 500 is going to be a very massive shift in overall weight, making your gas usage more efficient.

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