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it is accepted that most motorway accidents are caused by lane changing. When the motorway is busy it is safer to stay in the middle rather than dodgeing in and out of the left hand lane. When the motorway is quiet do 80 in the middle lane, no braking no gear changing low revs preserving fuel savng the planet. I have a 6 liter V12 and on a run my MPG is comparable to my mate in his rover, why? because he drives llike most idiots, braking, swerving, changing gear, hoping in between trucks, must get over to the left!