Hello, the DD453N is set up for 140 HP and the cruising fuel burn was estimated by a kind forum member at around 4.5 GPH. The extremely heavy stainless steel diesel tank in the stern of the boat was 28 gallons. It was apparently made new for the boat prior to it sitting for a few decades. I'd like to get it out of the transom area and switch to a lighter centerline tank in front of the motor. None of the Moeller plastic centerline tanks would fit too well due to a nominal 22" clear dimension between the stringers. I could try to work in a cube shaped tank on centerline and work it into the cabin interior (40 gallon should fit OK), or maybe put a pair of saddle tanks on either side of the motor on this extremely narrow boat (7.5' beam). If we launched on the coast on a nice day, Ocean City MD to Baltimore Canyon is about 60 miles. The boat should cruise in mid to upper teens but seeing it on paper and proving it in sea trials are two different things so I'm figuring on nominal cruise of 15 kts. Most of the boat's normal use would be trolling or bottom fishing in the ocean or Chesapeake so fuel needs would be much less. For longer trips we could carry a couple of Jerry cans with an extra 10 gallons. Thank you in advance for your input. I note that I haven't recently been putting anything on the forum while waiting for our Roberts steel trawler to sell. After 3 years who would have thought that it would be transacted during a week with a nationwide health scare. Finally we can get the parts to finish this boat.