The “Explained Engineering” YouTube channel released a comparison of actual technology’s hydrogen, combustion and fuel-cell engines.
Yamaha has collaborated with Toyota to develop a hydrogen-powered V8 engine.
The Lexus RCF has a 65.87 [lit] (17.4 [gallon]) fuel tank and a combined rating of 8.07 [km] / [lit] (19 [miles] / [gallon]), giving it a range of approximately 531 [km] (330 [miles]).
Toyota Mirai, which is powered by a fuel cell and carries 5.6 [kg] of H2. We get 142.2 [lit] total because it is stored in liquid form. It actually has three tanks, with a total MPGE rating of 65.
One gallon of gasoline contains approximately 33.7 kilowatt hours of energy. Assuming the Toyota Lexus RCF is hydrogen-powered, we would achieve 19 miles per kilogram. According to the EPA rating, 19 times 2.6 equals a range of only 80 [km] (50 [miles]) for our hydrogen RCF. In comparison, the range of our gas-powered vehicles is about 483 [km] (300 [miles]). Buckets are used as a visual in the video.
We can see from the calculations that the volume required to store enough hydrogen for this Lexus RCF to travel 300 miles is 14.1 cubic feet, which is larger than the RCF’s entire trunk.
Liquid hydrogen can store 75% more hydrogen than gaseous hydrogen held at 689.48 [bar] (10,000 [psi]) in the same amount of space. However, even if such a solution were used, we would not be able to produce enough H2 to power our vehicles.
We can see that the most efficient green energy technology we find in Toyota Mirai as a fuel-cell-powered vehicle that can easily travel 483 [km] (300 [miles]).
Check out the video and the provided sources in the description: