And why do you think this is being suppressed? It seems to be getting quite a bit of money invested in it, considering there's not a lot of money to be made. There's a few hydrogen fueling stations in California. The problem really is one of the chicken and the egg. Nobody is buying the cars because there's not very many fueling stations. There's not many fueling stations because there are not many cars. It's going to take localized fleet purchases (like with the CNG buses here in LA) to get things moving. Or a hybrid hydrogen/gasoline car.
http://cafcp.org/stationmap
http://www.extremetech.com/extreme/...en-fuel-cell-cars-hit-the-market-from-hyundai
I think it has definitely been suppressed. Much of this technology has been around for years. Cars running on chicken manure during the war, (Methane). Landfill sites are constantly burning off methane gas, (many years after being filled), to stop explosions from happening. Diesel designed his engine to run on vegetable or hemp oil.
http://rense.com/general67/FORD.HTM
Attempts to move over to LPG are always thwarted by taxation. Yes you mention about the current move toward LPG and LNG but where is the political will. Completely the opposite and that was even when LNG storage facilities were at capacity last year and natural gas prices were at an all time low and production was being drastically cut.
But what are they doing instead... dragging sludge down from Canadian tar pits right across America.