Your boat has 114 g tank , mine has 125 g tank, I cover anywhere from 80-120 miles on a days fishing, I fill up when fuel is cheap on the road , We have gas prices fluctuating here up too 30 even 40 cents per lt in any 3 week period that is a lot of $$ when you buy 350-400 lts of gas. I normally get 2 fishing trips on one fill , sometimes I may top up with 20-40 lts on second trip. I get over 2 miles per US gal maybe 2.25 depending on sea and weight . Bottom paint may make a little difference, as long as there isn't any growth it shouldn't be much.
The Yamaha command link should be very accurate ( should have been calibrated ) . You can see your fuel usage as you go along and fuel use up to that point if it was reset before you started. I reset mine when I fill up and whatever it shows "fuel used " that's what it takes to fill up.
Fill your tank and go out fishing say up to 80 miles from starting point so 160 round trip, as long as the tank was full to start with you will not run out, where you are boating you will use less than I do. I use much more fuel punching into the sea going out in the morning because I trim in so she cuts in to the waves, coming back in the afternoon i'm on the top of the waves trimmed out until close to the inlet , then she is all nastier.
After the first fishing trip fill up again preferably at the same gas station on the same pump facing the same way , check fuel used and if it doesn't match the amount she took to fill up you calibrate the command link to that. If the difference is very little less than 2% don't worry about but take note for next time .
Enjoy the boat, I hope it suits your requirements, mine suits me 100% but it is a compromise. Bigger boat is better in the sea and smaller boat better on the road . Deep V better going in to the head sea but not as stable stationary, variable deadrise the best of both worlds.