Hey, never thought of it but as many cars over Europe are diesel, regular vegetable oil (olive, wheat, peannuts...) would be used more often than alcohol. In some regions that is easier to make.
With the oil price today, people are already using this (illegaly) here in France. Moreover, my wife's father used it as a lubricant and would tell you that it works better than petroleum.
Thinks about the general smell in T2K. Each time you fry something you fill up your tank
.