Unfair advantage? .. no, as it was said before: the compressed ranges on our maps (and we need to have that, who wants to fly 60min before he may see an enemy) call for compressend (=increased) fuel burning rates. See it as a part of flight model. Some planes turn well, some dive better than others, and some have more endurance. Sometimes paid for with somewhat lower performance. If you delete the fuel rate multiplicator, you are just deleting one of the characteristics of a given plane. I am not an American customer, nor do i fly american planes. I have to break of combat more often than an mustang pilot while flyin my Lala or 109. But thatīs a part of the planes "character". I would certainly demand this if it was not implemented. Hey, you could even say: "The Thunderbolt is better diving than XXX. Put an end to this, as itīs just an evil way to please American customers!"
By the way: ever noticed how many Americanos fly LW planes?
