Two parts of your answer need to be converged as we look into the future.
You talk about the absence of infrastructure. You talk about the recent nature of the price advantage. Shouldn't we be worried about absorbing a large infrastructure cost, given that the price advantage is a new phenomenon and therefore might not be permanent? That is to say, we change the infrastructure to make it possible to use natural gas-powered vehicles to take advantage of a 20% price advantage, but then that price savings does not last, and we've spent all this money on infrastructure. Is that money then wasted?