Fuel Economy: The MPG illusion
December 15, 2008 6:40 PM Subscribe
Fuel Economy: The MPG illusion.
Quick, which of the following reduces gas consumption more?
a) trading in a 33 mpg car for a fuel-sipping 50-mpg car
b) trading in a 14 mpg SUV for a 16-mpg SUV hybrid.
Answer: They are both roughly the same. This not surprising once you apply a little math. "Miles per gallon is a ratio. Gas consumed is an inverse of that ratio. A ratio and its inverse do not have a linear relationship. They have a curvilinear one."
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