FWIW, our Nordic Tug 37 cruises at 7-7.25 knots, burning a bit less than 2 gph. Average fuel economy is 3.63 nmpg over the past four summers and 16,000 nm. Turbocharged 330hp Cummins 6BTA 5.9 M3. And I have not tried to subtract out the fuel used by the genset and diesel heater.
I am getting the same numbers as Richard in my Nordic Tug 37 (averaging 2 gal/hr not removing fuel for gen set and diesel heater) over 3 seasons now and over 600 hours of run time.
I agree with the others regarding the NT 32. For me, it is a bit small, but a great boat. When we were boat shopping we looked at several American Tug 34's as well. Great boats, fairly roomy, but only 1 cabin.
For us (and based on your posts we had similar wants/needs), the Nordic Tug 37 fit the bill. Cruising at about 1/2 throttle, at approx. 7.5 knots burns around 2 gal/hr., but when desired, you can throttle up (uses alot more fuel) and run for periods as fast as 14-15 knots. Also in a following sea, you can increase RPM to better match the waves essentially "smoothing out" the ride.
The other boat I strongly suggest for you is the Monk 36. A very good boat, but a little harder to find, but probably less costly than one of the above mentioned Tugs.
Caveat: All of the above is based solely on the limited info you provided as to your wants, needs, and budget (was that really your top end or just where you hope to land?). Also, depending on a lot of other factors, I am sure there are other boats that could work for you as well.