If you are concerned about your mpg try towing with it, after that anything above 30 is wonderful. Motorway miles at 60 with a wall behind you comes at a price like 23 mpg into a stiff headwind wind. You pay one way or another, either time or fuel, as said it's a big powerful car, it's never going to sip fuel.
There are so many variables that differences between cars and drivers mean figures produced are a guide at best, for instance from a stop I accelerate in second gear, using first to get the wheels rolling, then second to accelerate the already rolling mass, others would put foot down in first making second redundant, all have their effects.
Paul.
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