Took the Nissan as first car.

Goal 1: 1 lap Le Mans, cup, rolling start just before the last chicane
Goal 2: 2 laps Le Mans, cup, average speed of min. 225 km/h
Goal 3: 1 lap Le Mans, cup, no collisions, rolling start from the Porsche turns

Rewards: 5000 R$, 5 GC

My impression: very easy (I used R$ upgrades plus first Gold upgrades). Upgrade costs not very high so far.