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Not to burst your bubble but I have a strong feeling your calcs are off without looking over the mathematics.
Yes the amount of energy in gasoline is high, but there a many more variables than just simple physics. Kinetic friction, rolling resistances, drag/aero, inertia, etc. Yes it may take just a tiny bit of energy to accelerate mass to 60kph, But thats neglecting everything else acting on the mass.
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