Yes, I believe so Ellis. Anyway that was my understanding. There are also some vehicles that the manufacturers here in the US have warned the public against using. Ford and Lincoln have warned against using the ethyl fuel mixture with gasoline for two reasons:
1) fuel mileage
2) engine damage
now I am repeating this from a good friend that was told this at a Lincoln dealership. If it was a lie, he told it.

Best Regards,
odin1

People will forgive you for anything -but being right !
odin1