Tom B, I too have a single (carbed) 250 Yamaha. Navman fuel flow indicates around 15GPH at 22 knots / 26 MPH. I agree with the other parker guy, the weather would have to be stable and the fishing reports would have to be good to get me out there. We've had plenty of nice weather, but the Hudson reports have not warrented a trip to the canyon yet) ! PS - I Carry two GPS, Loran, Two VHFs, 406 EPIRB, etc. Kicker is being contemplated.