Ford ad from the BBC news site, 15-Mar-2010

The yahoo in this ad determines that because he now only fills
up the tank every other week instead of every week, he is
seeing a 50% improvement in gas mileage.

The text in the ad then reads, "Do the math in one." Thanks, Ford.

(Here is the article in which the ad appeared--some good high-speed video of a balloon exploding!)