I've read several posts on here and the consensus answer seems to be 45 gallons for the fuel tank size. I'm hoping to verify this before I run her dry and look like a jerk on the water. The river I run most of the time has no marinas so its a huge pain to run out. I'm also looking at putting a fuel flow sensor I can link to Lowrance unit so I can figure out how much my 225 EFI Merc drinks.