Yep, looks like triple XP or so, I just got 750,000 XP for winning the Indy 500. This time I opted to try and keep things close so I used my recently purchased Peugot race car (can't remember the name) as it had similar power and weight of the competition. The car was still obviously quicker than the competition, but with the help of a silly accident and me purposefully using horrible pit strategy it ended up being a decently close race. In the end I finished almost a lap over 2nd place. Think I might try this one again with the Audi R10 whenever I can afford it again.
Oh an some how I now have a B-spec driver at level 30 but my B-spec career is at level 29. Not entirely sure how that could happen.