Eating Too Much Leads to More Gas

http://www.freakonomics.com/blog/2007/06/26/eating-too-much-leads-to-more-gas/

In a recent study, researchers at the University of Illinois have calculated how much extra gasoline is being used each year because Americans weigh more and thus require more fuel to haul them around. The answer they come up with is an extra 938 million gallons of gas, or almost $3 billion dollars worth at current prices.