Jay Leno, is a fan of hydrogen cars. The American comedian and chat-show host thinks they are the shape of motoring in the future.

The BMW Hydrogen 7 which costs a cool £5m ($10m)

Leno comments, “For the past few days I have been driving BMW’s latest 7-series hydrogen car. There is some terrific technology there. It makes plenty of power for its size; the only thing that has limited it is the choice of fuel. This is a flex-fuel vehicle. It runs on either hydrogen or petrol. If you run out of hydrogen you press a button and it goes to petrol.”

Model BMW Hydrogen 7
Engine 5972cc, 12 cylinders
Power 260bhp @ 5100rpm
Torque 287 lb ft @ 4300rpm
Transmission Six-speed automatic
Fuel 19.2mpg (hydrogen) / 20mpg (petrol)
CO2 5.2g/km (hydrogen) / 325g/km (petrol)
Performance 0-62mph: 9.5sec. Top speed: 143mph
Range 125 miles (hydrogen) 310 miles (petrol)
Price £5m (but not on sale)

Jay Leno helped BMW to introduce the hydrogen car seven or eight years ago. “We did a rather dramatic demonstration where I drove the car up onto a platform. I let it run and put an empty glass under the exhaust pipe. I spoke for about half an hour and when I finished I shut off the car and drank the water that was in the glass. It wasn’t the best-tasting water I’d ever had but it certainly wasn’t bad for me.”

The main disadvantage, he says, “is that there is always a certain amount of hydrogen bleed-off as the liquid turns to gas. That means that if you let the car sit for an extended period of time, eventually the hydrogen would run out because it escapes. It’s deliberate. The hydrogen, as it escapes, keeps everything cold.”

It seems you cannot tell the difference moving from gas (petrol) to hydrogen. “It’s viable but it’s expensive. I think you’ll see it in the years ahead. There’s no hydrogen infrastructure right now. It’s got to be one of those things like when John Kennedy said we’re going to the moon, long before 1969. Everybody works on it and gets it done.”

Is the age of hydrogen nearly upon us?

As we saw with the GM Hy-Wire, hydrogen is the best alternative fuel. The big problem with it is its bad press – thanks to the Hindenberg and other airship disasters, it has an aura of danger about it and people imagine giant fireballs where once there was a car. The fact that hydrogen is less flammable than gasoline stands little chance against such images unless a public re-education program is instituted.

That is exactly what BMW intends with its introduction of the hybrid H7, a normal-looking saloon that runs on both gasoline and hydrogen. The company intends to import 25 H7s this year for loan to people who can advance the cause of hydrogen as a fuel.

For more than fifty years there have been cars that run on hydrogen – but early ones depended upon containing the gas within a pressurized fuel tank, thus allowing us to fear leaks and explosions (although neither has ever happened, as far as I know). BMW have chosen to cool the gas to a liquid, making it easier to handle and allaying our fears.

Hydrogen has so many obvious advantages as an alternative fuel that we cannot afford to ignore it. It has almost the same power to volume ratio as gasoline and the product of burning it is as innocuous as water. In fact, it is water. Rather than considering turning our farms over to ethanol-producing corn and starving ourselves in the process, we should be getting used to the idea of hydrogen as a fuel.

One warning, however: if you want to build an airship, use helium, not hydrogen…