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Pssst. Hey kid, wanna get a 30% boost in fuel efficiency? A dealership chain in Detroit is fitting Hummers with a device they claim can do exactly that. The "Mileage Maximizer," known to insomniac TV watchers as the "Vortex Valve," is a $190 option on new Hummer H2 and H3s sold at the dealerships. The valve's true benefit is dodgy at best, but the promotional opportunities in the era of $3.00 gas are crystal clear. In other news, we've got a trailer hitch-mounted tennis ball that boosts horsepower. For you? six grand.

More Mileage for Hummers? [Wall Street Journal]

Gas Prices Not Stopping SUV Purchases? [internal]