[mik]

i would not be too worried about oil or fuel too much, if and when it becomes scarce enough for the price to become unpalatable for motorists , it will more than likely happen gradually and people will ween off expensive to fuel vehicles and go to hybrids or electric,

and in the mean time some one will come up with a another viable fuel, the internal combustion engine is very versatile , it will run on many different fuels..