Fuel for early automobiles was a lighter form of gasoline closer to white gas or naphtha. About 1913, gasoline(white gas)supplies were beginning to diminish. By 1919, there was a movement towards a heavier gasoline (gasoline and kerosene mix), the introduction of heated manifolds and duel fuel carburetors became common for automobile intake design. Ford improvement articles discussed re-machining older Holley carburetors to accept newer fuels. A paper in 1913 discussed the conversion of coal tars to benzol. This research was begun in Germany. The issue was freezing in the winter and carburetors designed to mix the benzol. In 1913, too, a paper was presented to the Mid west chapter of the SAE about the future of "Liquid Motor Fuel." Alcohol was not looked upon favourable. Motor fuel distinguished between scare motor naphtha and kerosene. To allow for more motor fuel on the market for the automobile industry, the motor naphtha supply was increased with a mixture that included as much kerosene as the motor trade would allow.
Recently a discussion from the University Of Kufa, Iraq, was on line about a piece of research on using naphtha in a SI (spark ignition)engine. The researcher found that adding 7 vol.% of methanol to naphtha enhances the engine performance and reducing emissions even better than using gasoline as fuel.
This rethinking of fuels from 100+ years is considered to be neo-redundancy