63 mpg? What kind of a motorcycle is that?
I cannot believe that economy.
This truck weights about 2 tons.
What is the engine you have?
Stock diesel Chevrolet troopers yield about 25 mpg in town and around 33 mpg highway. Gasoline ones yield a lot less.
Too good to be true.
Check your calculus. Make a full tank calculus. Check that you are using miles and not km for your results.
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