In limp home mode, you wouldn't be able to rev the engine freely beyond about 1500rpm or so.
These are very heavy cars and it takes power and fuel to get them going..
So to get the best mileage, you kinda have to think like a F1 driver. In other words, braking is the worst enemy, and when you do have to brake, brake as late & hard as possible for the smallest duration while keeping momentum going.
I get 21 MPG in most city driving, and get approx. 24 MPG on the freeway but my wagon is usually loaded with several hundred pounds of cargo at all times.
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