Can someone explain, in simple terms, how I can determine the math to find out how much hydrogen I'd need to keep a car running the same as with using gasoline? Is their some type of formula that I can use to find out if the car is so many pounds, has a 200 HP engine and needs to be able to travel at different speeds as it moves along? The reason is that gasoline and hydrogen have different types of power ratings as to how far each fuel can actually go at certain speeds and under certain conditions. I'm just trying to understand the main differences as to how much hydrogen is needed to replace the gas in a car to get the same distances as a gas powered motor would get. Thank you in advance for any help on this subject.