km, control unit

Hello.

I read out the fault memory on an S8 and an A8 (both 97).Now there is a mileage for the measurement blocks.It does not match the mileage of the vehicles.
S8:km level 170000,shown 514356
A8:kilometres 141785,in the control unit 81.523
The diagnostic device is from car check.

Question 2

Torque display S8.According to the diagnostic device, it only shows 350Nm of torque.What could it close to?Stretch of power? Like the M3 e 36?

thanks for the answers