With my default vehicle, I managed 19.7 MPG (11.9 L/100 km) with a supercharged AWD V6 pessima coupe, driving pretty leisurely. I guess the supercharger really cuts into your mileage I got 21.6 MPG (10.9 L/100 km) without the supercharger, so it helped a little. It still has pretty short gearing, so I guess that isn't terrible. For the worst mileage, the T-series, with a 18.7L 2-stroke, pulling about 20 tons, got 3.24 MPG (72.6 L/100 km) You can practically still see the starting line. And for the best, I used the base Pigeon, and managed to get 58.3 MPG (4.03 L/100 km). You'll need a lot of patience to beat this one.