What was the factory published fuel mileage for a 3.5 coupe? It seems that everyone and their dogs can get better fuel mileage than me, but I want to know what the factory says.

My 2.8 gets 13, maybe 15 just hiway, and my 3.5 struggles to break 12mpg, usually getting 11mpg mixed driving. When I complain my mechanic always put the cars on the exhaust sniffer and tells me the mix is good. I'm also pretty gentle with the gas pedal.

I read somewhere that the 3.5 fuel consumption was 18 liter per 100km which i calculated to be 13mpg and that the M130 was about the same but I'm not sure if it was factory data. When the europeans publish this figure is it at a steady cruise or is it city condition?

My 3.5 is my daily driver and the premium fillups really add up now that gas prices are so high so I want to know if there is something I can do.

Perry

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1970 280SE Cab
1983 300D Euro 4-speed
past MB's:
1971 280SE 3.5 s/r
1981 300D
1985 300TD
1987 300TD