A litre of petrol will take me 11 miles, and most people even less. So a 118 lb tank, costing $795 (
https://www.cngunited.com/shop-cng-t...g-e-4-gallons/) will take me 11 miles. That's not including H2 cost. A litre of petrol, even at UK prices is only $1.45. And it fits in my petrol tank.