I get about 15-16MPG around town in my 500SL and 18-19 on the highway. Noticed the SIGNIFICANT improvement to 18-19 from 14-15 on the highway mileage a couple months ago after running a couple cans of Lubro-Moly injector and valve cleaner through the engine. Usually run at speeds of 70-85 on the interstate, so I consider this pretty decent since the car weighs nearly 4,000 lbs.

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Don
'85 500SL (Euro) - 186,000 w/a complete restoration and engine rebuild at 154,000
'95 C280 - 174,000