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A person who struggles with math can't do that, unless he gets a nice round number like 10mpg.
Suppose you got 26mpg and drove 5000mi/yr. How many gallons is that? Need a calculator?
But if I told you it was .038gal/mi, and 5000 mi/yr, you no longer need a calculator. Just multiply, and anyone can see the units will be gal/yr.
It's about making the math more accessible and intuitive.
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