TOPIC: 1999 Pontiac Grand Am Gains 17% MPG

I modified the throttle body on a 1999 Pontiac Grand Am with a 2.5 liter 4 cylinder. The owner said there was a dramatic increase in power. The miles per gallon increased from 22.5 to 26.3 for over a 17% gain. At $4 gas that's a savings of $25 for every 1,000 miles driven!