I can't believe how fuel efficient my new to me 2016 Yamaha f90 is! I've been out fishing 4-5 times on a tank of gas that was 3/4 full when I started. I still have 1/2 a tank in her left. Granted the distance isn't real far 3-4 miles, but I leave her idling the whole time out and there is a lot of moving around while fishing. Not sure what the capacity of the tank is but I know that with my old inboard engine that I replaced I would be lucky to get 2 trips on the same amount. I know thats comparing apples to oranges but I'm loving it!