Your car has the same city and highway rating as my 3.5L 5 speed Altima rated at 250 bhp/ 249 lb ft. I think that says a lot about the energy loss inherent in an AWD auto, the tires don't help either. I think your best bet is to slow way down; a scanguage would really help you determine your most efficient speed. I think 35 MPG is doable, but probably not on the freeway.
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