I look at this thread as what are you going to do when gasoline runs out. For me, nothing. I have a car that runs on natural gas, CNG. I also have a gas well and compressor, so fuel is not a problem. I know most do not have a gas well, but a lot of cities have CNG filling station. CNG should be given some thought as a secondary fuel source. Also locally CNG is $1.69 gal. and in some parts of the US it still below $1.00.