ivor toolbox: The speed for Mu Meter runs is set at 40 mph, & always has been, as far as I am aware, although there was talk by the experts working on Runway classification, in altering the speed for some classification runs back several years ago.
The Defender is fine for this although the Disco is much more comfortable, the exception to the 40 Mph limit is when operating on Snow & Ice when friction can be measured effectively below 40mph.
I make no comment on my Preference of vehicle
