Man, 37 is impressive from such a big vehicle.
I remember struggling to get 26-29 MPG US in my brother's old '98 Dodge Caravan driving on an exceedingly MPG-friendly route with a posted limit of just 80 km/h (50 mph)!
26 mpg (US) on the trip there pulling a small (450 lb) boat trailer. Little wind. This was almost exclusively driving with load, no cruise.
29 mpg on the return trip without the trailer. Drove slightly faster, same techniques. 15 mph crosswind from about 8 o'clock position.
https://ecomodder.com/forum/showthre...ling-4507.html