Right this weekend I'm visiting friends in Surrey, now google maps is suggesting 3 roots:
I'm more inclined to take the M4 rout since it'll be an easier drive and I can just stay in the middle lane and not use my mirrors (jokes).
However which will be do less damage to my petrol tank? The physically shorter rout with more hills and gear changes or the longer rout of constant speed? Is this a catch 22 situation or is the M5/M4 the obvious choice?