I have a 1998 with 7.4 and V-drives. I track the hours and mileage (GPS) for each tank of fuel. We fill up and will run until the tanks (2x 124 gallons) are just below 1/4. We typically cruise at 1200 rpm (6.6 mph) and rarely get up on plane. Our average between fill ups is 6.5 MPH at 1.28 MPG.
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David & Carol
Charlotte, NC (Lake Norman)
3700 SCR "Comfortably Numb"
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