This is in other words a complete non-issue. But I'd love to hear plans on safeguarding inevitable hydrogen leaks in residential areas. Should we tell people to get rid of their garages?
So what you've proposed is:
Burn gasoline (30%) * Charge batteries (80%) * Drive e-car (80%) = 19% efficient
It works better if you have a very high efficiency gasoline-powered generator (a 60% efficient generator gets you 38% efficient) but that can't really be done at the homeowner scale.Consider that hybrids or HEVs can improve substantially on the efficiency of just a pure ICE. I guess the problem with using an ICE for driving directly is that you are often forced to run it at RPMs and states where it is nowhere near that hypothetical 30% efficiency, simply to get the acceleration the user demands.
In the case of hydrogen infrastructure, we have nothing. If you're the first guy to buy a hydrogen car, you can't fill it up anywhere, there's an enormous amount of investment and work needed to get to that first hydrogen gas station, and I don't see that happening. Who would put up the money to make that bet?
Well, more than nothing, but not a lot just now. Though more is in development.
> If you're the first guy to buy a hydrogen car, you can't fill it up anywhere
I'm going to guess that the first several tens of thousands of people to buy consumer electric vehicles in the US will be clustered around the places where the existing infrastructure is [1], so that this won't be even approximately true (there'll be an interesting trade off until infrastructure builds out in that FCVs will have a longer single charge/tank range than EVs, but a much more limited area of operations since there'll be limited refueling locations especially outside of the "home" areas.)
[1] e.g., in California, http://www.cafcp.org/stationmap