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Old 09-15-2019, 11:54 AM
Dave Neptune Dave Neptune is online now
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Important

One thing to keep well in mind is how the beastie is tuned. It isn't how much fuel you can carry it is how well your engine uses that finite fuel supply. I have been a good mechanic and carb specialist most all of my life so keeping the tune good was easy for me.
I had an E35MKII and I could cruise at 5~5 1/2 knts in light winds and chop using around .7 gallons and hour. The fuel per hour is your base for cruising at an economical speed. You should be able to do a bit better at perhaps a bit slower speed with a bit shorter water line. Find your sweet spot which is easy to do with a vacuum gage and some testing.
A poorly tuned engine may run just fine but use as much as double the fuel because of tune, hull cleanliness and the prop.
A good base for fuel consumption with gas is "2HP per pound" of fuel per hour or about 15HP per gallon. Your G28 should be using around 10~15 HP through the cruising range or less.
Your prop and RPM are a big influence too as it controls the load you put on the engine. And the carb settings determine how much is metered at what efficiency. Checking the plugs for color is a big help and some here have even used an O2 sensor for carb tuning.
Once you know your usage and how far you "may need to go" you can determine how much fuel you need, then add 10% for bad weather safety.
Once you are set you still need to have a way to transfer the fuel in a safe manner.

Dave Neptune
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