No. Because you're bloody lucky to get over 60 on the motorways by me what with congestion or smart motorways, so no point.
Personally I don't go over 70-75 anyway due to the ever declining mpg the faster you go. Fuel is expensive yo!
Same here in my van.
Very rarely go over 60 now, due to the cost of fuel.
Being a frequent user of the M6 North, with my running and my lads sport, you`d be lucky to be able to get past 60 anywhere on that motorway, until it`s night time or once you`re past junction 37.