Nothing, we mean nothing, says success like rollin' in a big fat Hummer eh sparky? Only thing is, you can't stand the thought of those accusatory stares from your fellow highwaymen as you lumber along sucking-up fuel. Well, we guess you never heard of the Mileage Maximizer then? Don't sweat it, 'cause two friendly Detroit, rock city Hummer dealerships have, and they'll happily sell you the $190 wonder mod while touting its 30% increase in fuel efficiency. 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. Sure, GM and Hummer officials don't endorse the application of the "Vortex Valve" to the vehicle's intake manifold and may not even honor warranties. And just you never mind that no one will stand by those unofficial claims of increased efficiency or that tampering with the emission controls on EPA certified vehicles is, ehem, illegal. You go right on feeling better about yourself... after all, you tried, right?