Perform a cost-effectiveness analysis on a typical large tanker used for transporting petroleum. Determine, as a percentage of the petroleum cargo, the amount of petroleum that is consumed in traveling a distance of 2000 miles. Use data from Example, and the following: Assume the petroleum cargo constitutes 75 % of the total weight, the propeller efficiency is 70 %, the wave drag and power to run auxiliary equipment constitute losses equivalent to an additional 20 %, the engines have a thermal efficiency of 40 %, and the petroleum energy is 20,000 Btu / lbm. Also compare the performance of this tanker to that of the Alaskan Pipeline, which requires about 120 Btu of energy for each ton-mile of petroleum delivery.