Tire inflation really does make a difference

I have proof that inflating your tires helps gas mileage. check out the graph. the two big spikes upwards are when I got my tires inflated - first was my last oil change and the 2nd was last week when I did it myself, although I guess I didn't get it up to the best pressure, it sure helped a lot on my MPG. I had noticed it was going down, so I figured I should try it and it worked.

On August 4, 2008, tire inflation became the latest goofball political issue in the Obama/McCain campaign - Boston Globe article (including 2 YouTube videos).

Eventually, McCain agreed that proper tire inflation was helpful in improving gas mileage, but not before the McCain's campaign offered "Obama Energy Plan" tire gauges to supporters for a donation of $25 or more, and the Republican National Committee also gave tire gauges to newsrooms in Washington "in celebration" of Obama's birthday.