So milage is actually not bad. Cruise controll set on 65 is 32 mpg. Increas speed and milage starts going down (it's a beautiful wagon but not the most aerodynamic, be sure to take off the roof rack cross bars if you're not using them). The M104 is a real performer. Given enough pedal, it will really fly. A heavy foot in town, in traffic milage tips to the high teens. Normal surburban driving is like 24 mpg. Rev the engine to 3,000 and see if you like how it sounds.

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Michael

1988 300 SL (5 Speed)
1994 E320 Wagon
1997 C230