I'm new to Morgans sliding pillar suspension and collected my new car with 442 miles on the clock. It's been used as a Virgin Experience demo car by the factory and hence new drivers every time.
I've just almost doubled that mileage this weekend, and subjectively I think the steering has freed up a little. It certainly feels a little easier to turn the wheel more than an eighth of a turn either way, so maybe they do take some 'running in'..?
