Any car converted to run on LNG or Propane would work just fine on Liquid Methane.
Methane is just Hydrogen with Carbon added. Pure "hydrocarbon"..
The Carbon atoms allow for higher compression of the hydrogen gas, meaning one can store something like 4 times the amount of energy as methane than you can with hydrogen alone.
If this guy (and his process) is for real, what he has developed could actually be a major contributor to oil independence.
In our work with USDA and DOE, we have determined that we can produce about 5,000,000,000 barrels of hydrocarbon per year from easily recoverable biomass in the US. This should go a long way in making the US independent of foreign oil.