Oil companies are evil. We all know that. They make billions of dollars a year. How could anyone make billions of dollars a year and not be evil?

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There’s a new trend taking the roadways by storm. It’s called “hypermiling,” the fine art of using all sorts of tips, tricks and driving techniques to squeeze every last drop of fuel economy out of your car.

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One of the oldest and most -contested bits of advice for saving on gas is that by filling up your tank in the morning, when it’s cool, you’ll get more gas for your money.

The idea is that a gallon is a gallon is a gallon, but when you’re talking about gas, what’s inside that gallon is subject to change. The infinitesimally small molecules that make up a gallon of gas are tightly condensed when they’re cool. They expand when heated. That means a gallon of warm gas will contain fewer molecules than a gallon of cool gas.

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