One funny thing. In Europe the “weakest” gasoline we have is 95 octanes.
We have also 98 and 100 octanes.
I think our cars wouldn’t move with such 87 octane gasoline...
Anyway actually there are countries in Europe, as Portugal, in which almost 70% of all vehicles move with diesel.
Other thing our cars have less consummation.
I have a diesel Ford that needs no more than 1,4 gallon to make 100 km.