Welp, I had a super easy run with the merc-AMG GT GT3 '16. Boosted the bhp to max, max weight reduction, max traction control, had a 10 sec lead at the end after going off the road at least 6 times, one of those I nosed in and had to reverse to get back on track, lost probably 15 seconds on that one alone. I had fuel save on 6 the entire time, you're right, it saves your tyres from SOOO much wear, never had to stop for fuel, just a quick tyre change at the end of lap 3 (should have been lap 2 but I missed the turn xD). either way, DO recommend the merc!