21.83 with 3 BR's; 8 sp's... banged into the wall on the final corner thingy :(
I saw a spot in one of phaeton's videos where he boosts early for a BR on the straight, but I don't know if that's faster (feel free to tell us! :P)... of the few attempts I made at it, it's definitely harder. Doing that I can see a 5 BR lap, and I'm thinking it's possible to maybe get a double BR off the first corner, though that would be very hard as well. Can't see any others... unless Yeldar can do the one on the peak of the last hill :P