You talking about Outrun 2 or the new Coast to Coast?
In the original OutRun 2 I completed all challenges with AAA except the last 5 long races and one stage that I dont remember in which stage now, because it's impossible really, or the game as some bug while you racing (it happened once in my 60+ hours of play) or it's impossible, because in the last set of corners theres always to much trafic and if you break or hit something, you lose the time to get the AAA.
Anyway if it's the original OutRun 2 its possible to finish all, except maybe with all AAA. In Coast to Coast still need to play it more. Really want to find more time to play it.
I don't understand how so many people gave a miss to this excellent game, it's one of my favourites all time.