If we are going to be reliant on some other source to fuel our vehicles we have to start inventing things now. I imagine that in a few years from now, all of our vehicles will be run on something that probably as of today have not even been invented yet. Say for instance the electric car conversion is a great idea with a lot of bonuses. In a few years they will be able to greatly expand on this idea and probably run cars off of something like the electric model and even more efficient than what they have today.