When I was a kid, my mom would go to the store to pick up a half gallon of ice cream.

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He raced to the grocery store and bought half a gallon of chocolate ice cream.

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Except for the half-gallon of gas and the chain oil, but I'm fixin' to make the thing run on plum brandy.

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Or consider how much easier it got to earn the money for a half-gallon of milk (56 minutes in 1900, down to 31 minutes in 1930) or 100 kilowatt hours of electricity (107 hours in 1900, but only 11 hours in 1930).

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The chemical, one part nitrogen to three parts hydrogen, stores a lot of energy: a gallon of it has about half the Btus as a gallon of diesel.

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They now use about half as much water per gallon of ethanol as they did a decade ago.

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"I mean, you are talking about saving a dollar and a half, two dollars a gallon and that's unheard of, " said Pickens, who, as an investor in Clean Energy, has a stake in the success of natural gas.

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Well, beginning with the 2008 models, the White House wants to raise the current 21 miles per gallon to 23 and a half for light trucks.

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It seems kind of crazy, because natural gas is about half the price of gasoline (on a per gallon basis) right now.

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In the two and a half weeks since he first floated this idea in Pennsylvania, gasoline prices have already risen more than 20 cents a gallon.

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