I have a 18ft 1977 glastron with a johnson 140hp. What should the fuel consumption be for playing hard, pulling a tube for 1 hour with boat fully loaded at 1200 lbs?
Fuel consumption can very ALOT from boat to boat. But, if it helps I have a 1978 Glastron with a 150 Evinrude and "playing hard" I will burn 5gal in about 2 1/2 hours.
Could even be a bit more, that 1/10 correlation is just a very rough estimation. But yes, 5 gallons of fuel in an hour of pulling tubes, skiers, etc. with a 140 sounds reasonable.