I've an '89 190E 2.6 with 60K miles which I got in June, 1999. During the first 6 to 7 months, I'd average about 23 mpg (this is in Colorado at 5000 ft. or higher) with highway up to 27 to 28 mpg and town 20 to 22 mpg. in the following 6 months the mileage has decreased to the point where my average is arount 18 to 20 overall. (I will have lambda and O2 sensor checked soon)
I'm curious as to what mileage you other guys may be getting on a 2.6 or 3.0 M103?