Only time I use motorways is when I have to get home quickly without too much stopping when a problem occurs. When the clutch nut started to loosen, I set her at 60mph and minimised gear changes - covered 70m without the clutch making an appearance through the primary cover. Boring, uncomfortable, uninspiring, tedious - but useful when you need 'em. Did the same when I broke a front mudguard bracket and had to ask a builder working on a house by the side of the road for a cable tie to bodge it up.
Also used the A1 on the Kwaka on the way to Dundee when it p1$$ed it down. Just wanted to get to dryness asap.
The Kwaka eats motorway miles without a thought, although I still don't use them for the reasons mentioned above.