I don't really get this game. Out of the current 8 tracks there are a couple of races I get absolutely dicked even when I use 3-4 nitros, struggling to break out of 6th position, then the next track I come first and don't use any nitro at all.
I like the game, for the price (I paid less than half the price of the lowest RRP/MSRP title) but the Spot Races and other modes aren't really entirely clear.