Running around Norris lake without any surfing or pulls 70 mile round trip would be no issue. Water was very calm to glass and I stayed at 4000rpm or less. With the 1.5 Trans and the 15x13 prop 4000 is 20mph so 70 miles is over 3 hrs of runtime.

If you surf while making the cruise I would strap a fuel can to the platform as CYA!