“Peak Oil” is no more about the availability of crude oil than “Global Warming” is about the ever-changing climate.
People who worry about “Peak Oil”, are ignorant about basic economics: substitution, innovation, improvements, efficiency. At $3/gallon, the price of gasoline is already at or above the break-even cost of some other proven conversion technologies. Gasoline in Europe is around $6/gallon. At that price, we could convert municipal garbage and sewage sludge into motor vehicle fuels and have all we wanted to buy.
Except that the higher price in Europe isn't a reflection of differing market forces .. it's simply the result of higher taxes there than here.
Syngas?