From GTPlanet Game Guides

Audi R8

With this setup;
Tyres:R2/R1
Brakes:6/5
Springs: 11.5/11.7
Rideheight: 80/80
Damper Bounce: 3/3
Damper Rebound: 6/6
Camber: 2.5/1.5
Toe: 0/0 (Can take 1/-1 without ruining tyrelife. Recommended.)
Stabilisers:5/5
Gears: Autoset 25
Driver aids: ASM 0/0 TCS 6
Downforce: 50/70 (can take 55/77 if wanted)
LSD: 20/35/30

It gave me 8 laps before I ran out of fuel. The tyres where still only dark yellow, so this car is nice to it´s tyres!
Best lap: 3´24.272

+ Fast, good tyre-life
- Fuel consumption, snap oversteer.