I'm catching up to this thread a little late and haven't followed each twist. I run our new Honda 2.3 (and the Honda 2 before it) at very low throttle settings most of the time. On flat water I typically set the throttle just above what it takes for the centrifugal clutch to fully engage and that pushes our Montgomery 15 along at about 3.8 miles per hour. At those throttle settings we typically get between 2 and 2.5 hours on a tank, which I believe is around a liter. For fuel on long trips, we use an external tank with a rubber fuel line and a bulb pump rigged to connect to a modified spare fuel cap on the motor. It takes about 30 pumps of the bulb to fill the tank when empty. If there is not much going on, we normally run the tank down until the motor starts to falter and then pump the tank full. We've done numerous week long trips and this approach has always worked well for us. David GrahBishop CaliforniaMontgomery 15 - Sky Date: Mon, 19 Jun 2023 10:23:04 -0700 From: Dave Scobie <scoobscobie@gmail.com> Subject: M_Boats: Re: Aux fuel To: For and about Montgomery Sailboats <montgomery_boats@mailman.xmission.com> Message-ID: <CAGjBOA6crkUaMGo0QzGWtkZFR18v_=+-C6yCAE324RGWCjC1WA@mail.gmail.com> Content-Type: text/plain; charset="UTF-8" Honda 2/2.3 at about 1/2 throttle (more than enough for a M15, Sage 15, SageCat, and Sage 17), burn about a little under a liter and hour (aka one tank of fuel). My practice is to refill the tank every 45-50 minutes so the motor will restart on a single pull (if you run dry multiple pulls needed to get fuel into carb). I recommend using a 'No-Spill' brand gas can. For day sailing I had a 1-gallon that was easy to lift and fill motor. For cruising had an additional 2.5gallon can. Would transfer fuel from 2.5 to 1 gallon can for easy filling the motor. Info on 'No-Spill' - https://nospill.com/ The 3.5 gallons in cans and a full motor tank gives 15+ hours of range. :: Dave Scobie :: M6'8" #650 :: Baba 30 #233 DEJA VU :: former owner SV SWALLOW - sailboatswallow.wordpress.com/ :: former owner M17 #375 SWEET PEA - m17-375.com :: former owner M15 #288 SCRED - m15namedscred.wordpress.com