A diesel engine will go much farther on a gallon
of fuel that the standard gasoline engine
because of their designs, and due to the higher
energy density of a gallon of diesel fuel. But,
it also takes a bit more oil to manufacture a
gallon of diesel than a gallon of gas, with
the production and refining processes for
diesel producing more gases that trap heat.
Therefore, when you consider the relative merits
of deisel and gas cars, try knocking the MPG
estimates for the diesel car down by 20 pe
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