Transportation Energy Efficiency - Box

Transportation Energy Efficiency - Box

Terms Used and Calculations Made

The following definitions apply to the discussion here:

  • Energy is measured in British thermal units (BTU).
  • A passenger-mile traveled is one passenger transported one mile.
  • A ton-mile is one ton transported one mile.
  • Passenger energy efficiency is the ratio of passenger miles traveled to BTU (or to energy consumed).
  • Freight energy efficiency is the ratio of ton-miles to BTU (or to energy consumed).
  • Fuel economy is the ratio of miles per gallon of fuel.