I personally don’t think that the density of the fuel is a critical variable with respect to adoption of the technology, largely because compression technology is readily available.
DOA,
the density is ultimately related to how far a vehicle can travel on a single tank. So while compressing the gas may not be a problem, putting a sufficient mass of fuel in a vehicle to be driven long distances is a problem.
While the garage NG compressor is interesting I'm wondering what the home insurance policy looks like.
I think for useages like communting between work and home electric vehicles will be much more practical. If carbon capture is ever legislated, then centralized burning of the NG to generate electricity is also more practical.
regards,
Charlie