Just back from a 1185 mile trip in my C300 Sport.
Before leaving, my dealer updated both the Keyless Go and engine module software, as well as replacing the fuel shutoff valve to deal with an intermittent fill problem. In the 11 days I was gone, Keyless Go worked flawlessly and I only hit one gas pump that required me to hold the pump handle manually for a normal fill. The transmission did shift more smoothly than before, and the car started in first gear while in Comfort mode.
I hit horrible traffic for much of the trip, with three hour delays heading down, and two hour delays on the leg out to NY. Outside temperatures often hit 90 F, but the climate control did a great job keeping my wife and I comfortable. I can finally say that the ventilated seats do actually work, and in that heat they had an obvious cooling effect on the seat backs. I also drove through several violent thunderstorms, and the car remained stable and the wipers were able to keep up.
I hit a variety of road surfaces, from smooth to WTF? I nailed a couple of awful potholes that I thought would blow a tire or bend a rim, but nothing bad happened. The Sport suspension was fine on most surfaces, but did feel rough over pavement breaks and choppy surfaces.
The seats were really good and both my wife and I commented on how good we felt when we got out of the car. No aching backs or discomfort at all.
BLIS was a big help, especially in heavy traffic. Any time a car was close when I turned on my directionals, it gave off warning beeps so I wouldn't turn too early.
Fuel economy was surprisingly good given all the traffic I hit. My overall, start to stop, finish for the entire trip was 30.5 mpg (US) with an observed high of 34.2 during one stretch. I did not check this against actual fuel used but, in the past, the computer has been extremely accurate when checked.
I did reach speeds of up to 80 mph with no audible wind noise, although road noise could get loud on some surfaces. I had a chance to spend some time in a brand new Jeep Cherokee, a fairly new BMW 328i, and a Toyota Camry. By far, the quietest and most comfortable car in this group was my C300. Everyone was impressed with the exterior and interior styling of the car. Several times I had four adults in the car, and everyone was comfortable. The only negative comment was that exit from the rear seating area was difficult.
Basically, my C300 was perfect and a great car to be in for this trip.
I observed if you drive with cruise mode, it gives better milage as if the car knows best way to control the speed.
-Ayan


