Got a chance to give my C140 (S500 Cpe w/ 94K) a serious run! Up to now, it's just tooled around town on the local expressways at speeds of 70mph or so. Most times with the traffic, you are lucky if you can do 60 mph!
But last week, we went to Napa Valley to attend my son's graduation and appointment as a CA Game Warden. Very proud parents! We enjoyed Napa and the surrounding valley very much. Took in a lot of restaurants and we had a great time. The weather was very cooperative, staying in the mid 80's with cool mornings of 60F! Just like San Diego.
So the C140 was tested by: 525i, 518i, M3, 500SL, a Subaru(?), and a few others that I can't quite remember. Remember passing a grey 500E that was driving very slowly. Good thing for me! Only the 500SL passed me! Can't win them all.
But it handles like a dream at 120 mph! I've really don't drive this fast as a rule but it just sat there beautifully at 120mph as it does at 60mph! Also wanted to 'clean' out the car's intake/injectors abit. Too bad I didn't have some X-66!
Used Techron for three (3) tankfuls. I honestly don't notice any difference in it at idle (still very smooth) but some definite improvement in acceleration from standstill.
The acceleration from 80 to 110+ is really something. Of course, that's where the revs and torque peak. But it is impressive when you're behind the wheel.
For a large stretch of US5, there's nothing but straight road and lots of heat. Temp was around 100F. Also since some of it was repaved (heading North), it as smooth as glass. Not so on US5 South. Many sections still patched w/ asphalt and some sections are really bumpy. So held the speed down and went faster where conditions would permit.
Gas mileage was impressive. Averaged 20.6 mpg for the trip. Very good when you consider the higher speed and continuos A/C use.
Water Wetter with 60/40 water/AF ratio plus my aux fan mod: At 101F, the temp gauge read a little over 100C. At lower temps (90F), it stayed around 95C.
All I can say, I liked my C140 before but now I'm really impressed with it's performance, ride and handling. The run up and back were non-stop for eight (8) hours so it got a good test!