I have a 1991 Thunderbolt bassboat (17'8") which weighs about 1180lbs. dry with a 1991 Johnson V-6 150 horsepower. I have a 20 gallon gas tank and it only lasts about 15 miles (estimate). Granted, I like to generally drive fast, rpm @ 6,000 (or at least that what the meter says). I have a...
