BMW's Hydrogen 7 sedan has a dual-mode engine, one that can drive on hydrogen with a range of 125 miles, or gasoline, with another 300 miles at the ready. The vehicle has two tanks, and boasts performance of up to 260-horsepower from its 12-cylinder engine and acceleration from standing to 62 mph in 9.5 seconds. Top speed is limited electronically to 143 mph, and boasts a dual-mode power unit controlled at the touch of a button that can switch from hydrogen to conventional premium gasoline. The BMW Hydrogen 7 comes with a 16.3 gallon gasoline tank and an additional fuel tank taking up approximately 17.6 lbs. of liquid hydrogen. And just think: all this, with the creature comforts of a BMW 760i all around you.