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Physics dictates that cars with small mass will travel more miles per gallon(mpg) compared to massive trucks. Does this imply that small cars are moreefficient machines? In this work a mileage efficiency metric is defined as aratio of actual car mileage (mpg) to the mileage of an ideal car. This metricallows comparison of efficiencies of cars with different masses and fuel types.It is as useful to quantify efficiencies of cars as the concept of dragcoefficient is to quantify the efficacy of their aerodynamic shapes. Maximummileage and lowest CO2 emission of conventional gasoline cars, at differentdriving schedules, is reported based on the concept of an ideal car. This canhelp put government imposed standards in a rigorous context.

Mileage efficiency and relative emission of automotive vehicles