about 22 avg.. 27highway at a steady 70mph.No a/c issues other then the same as with most systems people dont run them during the winter and leaks can develope on the w210 you have onboard ac diagnostics so that helps identify problems and solve them if they happen.How much do they want for it?inspect,inspect,inspect
how much?
where are you located?
Are you paying cash?
ohlord

 

Lee, I average 25 MPG in mixed, 23 city and 30-31 highway on just about every tank. When I fill up, I take the receipt and do some math with the mileage on my cell phone. It drives my wife nuts. I love it. This car is wonderful on gas. Good luck.[8D]