Detroit Hummer and Hummer of Novi are trying to woo consumers with what they call the "Mileage Maximizer," a mechanical modification they claim helps the hulking vehicles get 25 miles per gallon in highway driving. By comparison, an unaltered H3 gets 19 to 20 miles per gallon on the highway, according to Hummer spokesman Nick Richards.

The modification uses a device manufactured by Air Synergy Labs Inc., one of hundreds of aftermarket parts companies across the country that are using homegrown methods to try to boost fuel efficiency. Spencer Robley, chairman and president of the Las Vegas-based company says his company’s product — which it calls a "Vortex Valve" — can help drivers increase fuel efficiency as much as 30%, though he concedes there’s no official verification of that claim.

The promotion has been so successful at selling new Hummers in fact, that these boys are now considering expanding the modification to more stores and vehicles.

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