Not at all - a demo should be as good as a new one in real terms.
We will sell a demo from day one, so the chances of it being thrashed are almost nil.
The only demo vehicle that we do have, that has been driven hard is the WRX that I drive, and when I do a demo in it, I drive it until it is warm, and then I control the driver as far as I can, with respect to driving it hard.
Normal demo's should be fine, however.
Our WRX that was the demo when the 2010 shape was released had a particularly hard time from the beginning, however, I sold it to a friend after being very careful to tell him that it had been driven hard, and 4 years down the road, he's done over 100 000 km and the car is running perfectly.
Very often cars that are driven hard from the beginning loosen up better than the gently driven ones, and reward you with better performance and decent fuel consumption.
So, what I am saying is that a demo should be fine, and remember it is also still covered by manufacturer's warranty so all should be well.
Final word - anyone who has been to a car manufacturing plant will know that the last point on the manufacturing conveyor belt is the point where the car is rolled on to a rolling road, switched on and taken up to maximum revs in each gear - all with an ice cold never run before engine! If the engine copes, it's considered to be OK after that!
