This data-file quantifies the energy efficiency of fourteen different transportation types, in mpg, miles per kWh, passenger miles per kWh and CO2 intensity per passenger mile.
“Efficiency” is calculated using an apples-to-apples methodology, comparing real-world fuel consumption to equations of mechanics (i.e., stop-starts and air resistance, per Tab 3 in the model).
Electrification generally offers a c4x efficiency gain, jumping from c15-20% on conventional oil-powered vehicles to c60-80% on electric vehicles. Hybrids and hydrogen also yield modest efficiency improvements.
Most exciting is the set of emerging, electric transportation technologies, which are faster than incumbents, yet also achieve 4-120x efficiency gains per passenger mile (chart below).