1). Nitrous does not work in B-spec. The Ai also never uses nitrous.
2). When you make your pitstop, you can choose whether to accept fuel or not by saying YES or NO to fuel. If you're getting fuel, wait till it's about half full (I think the number will say "40", but I might be wrong) and then press your X button. this will stop the guy from putting fuel in your tank. This has 2 advantages:
a. it makes the pitstop quicker (the tire guys can put on tires faster than the fuel guy can fill a tank) and
b. a car with a half-full tank is lighter and therefore slightly faster.
...obviously, you need to be careful when doing this. Don't wanna run out of gas!
![Bang Head :banghead: :banghead:](/wp-content/themes/gtp16/images/smilies/banghead.svg)
So you need to be aware of how much fuel your car has consumed during its laps around the track, and plan ahead by estimating how much you're gonna need as you return to racing.
3). Believe it or not, I haven't gotten around to doing the Fuji 1000 yet, so someone else can help you there. Or you can search the "Race Reports" area of this forum to see what others have used in the past. 👍