Yeah, speed is very important. Our C was small like yours, only a little narrower, and I only got ~ 8 MPG because I drove fairly fast for an RV. Best fuel economy was ~ 10 MPG driving slowly while sightseeing in mountains or rolling terrain out west. Mine was small enough that lower-speed fuel economy could have improved if it had the 5.4L V8 instead of 6.8L V10.
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