setr game_enableFlyThroughWindscreen true ensure mrp_vehicle
hold ALT while in vehicle
/flip to flip vehicle that's on the roof
config.fuelConsumption.lPer100Km is based on vehicle class of which there is 21 and each class can have different consumption per km set.
Vehicle Classes:
0: Compacts
1: Sedans
2: SUVs
3: Coupes
4: Muscle
5: Sports Classics
6: Sports
7: Super
8: Motorcycles
9: Off-road
10: Industrial
11: Utility
12: Vans
13: Cycles
14: Boats
15: Helicopters
16: Planes
17: Service
18: Emergency
19: Military
20: Commercial
21: Trains