LOL. Not really, when you think about it.

Different heights above sea level mean different ambient pressure levels, this affects performance etc. Do some research on the Pikes Peak events and see what is said about the differences when the car is going through the ascent.

But, easier to understand is the climate differences. We all know how much better our cars are on cold days. Now carry this across to the Rolling Road. Modern RR software can compensate for differences in temperature and provide a reading that is more standardised.

Imagine running your car on a Rolling Road in Scotland in winter, then running it on EXACTLY the same Rolling Road but in Cornwall in summer. There is no way that the Power-at-wheels figures would agree!! How could they?

Make sense now??