HI Blue, It all depends. any were from 3 to 8 gallons a trip. This past weekend we were fishing about 5 miles from the ramp, and the pogies (bait) were about 1 mile from were we were fishing. (We grab about 6 pogies, toss in the live well, head out to the fishing grounds, do some drifts, catch fish... go back and get 6 more pogies.....) so for the two days of fishing this weekend we burned under 7 gallons.
I should/will be seeing better fuel #'s as I just raised my engine up a notch to get closer to my ideal RPM's and I am also learning to work the trim tabs and the engine trim together to get to that sweet spot.