(21) Benzol.
Benzol has been used to some extent in Europe as a fuel, its use being due to the rapidly increasing cost of gasoline.
Benzol is a distillate of coal tar, and is a by-product of the coke industry. In England benzol brings approximately the same price as gasoline (called petrol), but benzol proves economical for the reason that it develops more power per gallon.
Benzol is not as volatile as gasoline, but is sufficiently volatile to allow of easy motor starting.
Benzol is also used for denaturing alcohol.