Is there anyplace that hasd more natural gas than oil? Or where it is more easily accessible?
It would have to be postwar, I can't see the infratructure put in place widely pre-WWII. But perhaps something can be done in postwar Europe? Oil imports are tighter, maybe there is less Marshall aid or the oil price spikes early. as a result, gasoline is rationed and used for essential transport only, and urban private cars increasingly go over to unrationed gas (filling from extant cooking gas networks initially). By the tiome the oil market stabilises, many Europeans already own gas cars. When the oil fields in the North Sea and Noirth Africa open up, natural gas becomes plentiful close to home and the infrastructure for gas vehicles expands as the price difference grows. By 1990, hardly any European filling station is without a natural gas pump and most sewage treatment plants already feed biogas into an established system. The USA still largely runs traffic on gasoline (as do Europe's militaries), but petrol cars are dying breed outside of specialty niches (diesel remains the favorite for heavy transport and all-terrain vehicles).