BMW Group has plans of introducing bi-fuel (Gasoline-Hydrogen) 7 series this year. With the 170-liter liquid hydrogen tank storing about 8 kg of hydrogen, the car has a hydrogen-fueled range of 200 to 300 kilometers (125 to 185 miles). On gasoline, the car has a range up to 500 kilometers (310 miles). Now from past experience with hydrogen (e.g. The Hindenberg), BMW admits that the biggest obstacle is the safe storage of hydrogen. Hydrogen has to be stored at what -253C at high pressure. And another thing, how much does BMW 7 series cost???