The Space-X MethOx engines use
GASEOUS methane and oxygen. (Also the TRB3 ?

Meyer used various forms of hydrogen and oxygen gas the dune buggy series 2 vehicles During a visit by a car maker, ( GM) Stan demonstrated the buggy running.
The GFR system ,gasoline injectors and computer control s were added later by major manufacturer Unfortunately, Stan never proceeded with further of the EPG development. 1986-1987 NSO? The 1500 cc Volkswagen only needed about 7 liters per/minute. Too much hydrogen floods it out and in the WTVN, Charlie Holbrook can be seen
adjusting the input to the engine because electronic acceleration and carburation controls had not be perfected at the time of the test runs.