So discovered today that my speedometer is not correct. Had a friend follow me and i though i was speeding going 80, but in fact my friend told me after that i never went over 70 to 75. I noticed that when the car is rolling that the speedo jumps from 0 to 20 and stabilizes when i get about 30mph on the speedo. Also I am still having an issue with the idle. I still have not tried to adjust the idle, but when the car is at a temp of 85 it idles ok, but it gets to about 90 and then raises the idle. So my question is should the temp go up that high. I was under the impression that it should not go over 85. Also the fan that is in the front of the car never turn on. I am guessing that could be an issue. Is the fan controlled by a relay somewhere? Any ideas would be appriciated.

Speedometers are very rarely accurate. From any manufacturer. And they tend to read high (as a fail safe mode?). Calibration is fairly cheap. Usually around US$100.

Regarding the temperature have the mechanic verify the reading. You don't know whether it is the gauge or not.

Also another thing is that after my first tank of fuel the mpg was 24 driving around town. I was hoping to get a little more. My 96 w210 E300D gets around 30mpg driving the same roads. Just got the valves adjusted and hoping that helps a little bit. I am also going to rebuild the injectors with the monarch injector nozzles.