Real Fuel economy numbers are already posted on the MB website...
2L Model
- Acceleration,
0–100 km/h 10.1 seconds, with manual transmission.
- Fuel economy,
city estimate Manual: 9.2 litres/100 km
Automatic: 9.2 litres/100 km
- Fuel economy,
highway estimate Manual: 6.7 litres/100 km
Automatic: 7.2 litres/100 km
Turbo Model
- Acceleration,
0–100 km/h 7.6 seconds, with manual transmission.
- Fuel economy,
city estimate Manual: 10.2 litres/100 km
Automatic: 9.5 litres/100 km
- Fuel economy,
highway estimate Manual: 6.9 litres/100 km
Automatic: 7.4 litres/100 km
Plus, there's nothing wrong with having only 2 valves per cylinder since it produces better Torque... just look at the B-Class numbers. The 2L produces 134hp and 136 lb-ft of torque!!!