180-205gal, have not exceeded that and I've run the Tom's and back from the highlands. I burn roughly 16-17gph at 28mph cruise, sometimes I'll run 30-35 if the seas are flat and burn more fuel, but tend to burn about 75-80gal each way to the canyon. Trolling I burn about 4-4.5gal/hr, and typically plan on trolling 10 hrs, anything under 8 hours is a waste of time to make the trip to the canyon for a day troll. This leaves me 50gal reserve if anything goes wrong, even if I had to burn .9mpg going home at a 12-14mph chug in nasty stuff I can reach home, or run for a closer port if necessary and get in safely. I always top off as I leave the dock, I mean gas to the fill at the gunnel, I leave no room for error. I'm also running 4 strokes, guys with 2 strokes will burn atleast 20% more fuel, sometimes way more if not fuel injected or newer technology. also, I'd highly advise against going to the canyon without twin engines, really not a place you want to break down at. Had a guy break down 50 miles out 2 weeks ago, took sea tow 5 hours to reach him to tow him home, at the canyon you may not even get them to come, will likely be CG and will cost a lot, thats why twins are a must, or run with a bigger buddy boat at the very least. Always look for a 2 day window after you plan to go if your a newbie to play it safe, never run between storms until you get the hand of things, and even so still not a great idea, perfect example is yesterday, had a buddy run out for bluefin on a 1 day weather window that never became a true window, ran out in nice seas and got his behind handed to him coming home last night, even though they had tuna he said it wasnt worth the beating they took, and he loves to tuna fish as much as I do. Wait for the right days if you do run. Also, a handheld vhf and handheld gps are a must, along with a life raft and epirb, plb's a junk and not for offshore use. Spend the money to be safe if your going offshore.