Larry, and guys,
I just lost a long post replying to your comments, so I will repeat it briefly.
I agree the engine is a little light on low end torque, and when I was driving East on I-70, going uphill at altitudes between 8,500 and 10,600 ft. I had to shift into 3rd gear if I got below 60 mph or so to speed up or maintain speed. I sort of attributed the lack of low end thrust to the lack of oxygen. In any case the C230 Kompressor is a stark contrast in low end torque, but like I noted earlier the C230 is lucky to get 26 or 27 mpg on the highway.
I ordered 205/60-15 Michelin Pilot XGT-VR4 tires from Tire Rack today. Should be here Monday. I have attached a photo and will add a few more tonight if this one shows up. Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)