A444. From Burton towards Nuneaton, heading to Coventry (you hit the A5, then the M69, then head into Coventry from the Wyken end). I tend to use *all* of the road on that run, for a few reasons:
1) It's usually veeeeeeeeery early morning, so there's no bugger around.
2) The road is in a slightly poor state of repair on the standard driving line, given that no-one in authority actually knows that road still exists.
3) It's bloody good fun.
And 3) holds true in both of my cars - in the Seicento I can drive at the absolute limits of the car if I have all of the road and still be well within both the actual and sensible speed limits of the road. In the Olds, the run is far too enjoyable to be legal if I can get up to the speed limit - and I need all of the road to do that. That might just be me who thinks that hurling 5000lb of Detroit scrap down a road like that is fun, of course....