I hope natural gas works out. My only concern about natural gas for vehicles is that I recall reading something about Exxon recently buying a company that had the patent for the process needed to cleanly refine natural gas for vehicles. If my memory is correct, it doesn't take too much of a leap to predict those friendly folks at Exxon will use their monopoly to jack up the price of natural gas at the pump once it becomes available nationally. Great for Exxon and people who own their stock, but terrible for the rest of America. Wondering why the Obama administration didn't prohibit that Exxon purchase?