table on wikipedia says the 15% thing might be out of date. https://en.wikipedia.org/wiki/Brake-specific_fuel_consumption?useskin=vector https://en.wikipedia.o

table on wikipedia says the 15% thing might be out of date. https://en.wikipedia.org/wiki/Brake-specific_fuel_consumption?useskin=vector https://en.wikipedia.org/wiki/Brake-specific_fuel_consumptio...