I have a 1971 20CC with 2003 Suzy 140 4-stroke.
at 30mph and about 35 gallons in the tank I get 5 miles per gallon.
at 6,000rpm with 35 gallons in the tank, I top out right at 40mph (with t-top)
a full day of offshore fishing for me requires 12 gallons of fuel....and I do it five days a week in the Summer
