Biodiesel, coal to oil, and gas-to-liquid oil are competitive at around $60 a barrel and the price will only drop as the technology improves.
Ethanol is even cheaper.
What does this mean? Well, since we aren't currently peaking in coal or natural gas, and there's lots of surplus biomass out there (particularly cellulose), the long term price of "oil" is going to run around $50-60 a barrel whether that "oil" is actually oil, or not.