I got rammed wild during the first pit-stop and I lost like 10 seconds, because Ferrum entered way too fast in the boxes... so, I'd make or larger fuel checkpoints or have more of them (there were like 3-4 I think).
Also, I agree with fuz, there weren't many place to overtake, maybe because the corners were a little too much small, but overall the track was nice.
Also we can disable collisions at pit stop. Maybe it will better?
It would be GREAT. If you can do, it's perfect.
Also, fuel was a nice addition and worked out perfectly, it adds a lot of strategy into the race.