From those numbers calculated above we can see that this would have quite a large effect on the gas consumption of the fleet.

FORBES: How to Make the US More Like Europe

The entitlement numbers are calculated as the present value of future promises less future taxes (at present rates) to cover them.

FORBES: February Surprise?

And the grumbling about vehicle fuel economy is getting loud enough that the U.S. Environmental Protection Agency is coming under pressure to change the way the fuel economy numbers are calculated, something it hasn't done since 1984.

FORBES: Fuel Economy Sticker Shock