Fuel Economy

This guide explains how to configure fuel economy data for transport analysis within the LEAP software, covering unit selection, aging profiles, and the calculation of stock average fuel economy.

• Fuel economy in LEAP is defined as energy consumption per unit of vehicle-distance traveled, or its inverse for miles per gallon (MPG). Users can specify fuel economy for newly purchased vehicles using various standard units, including US and UK MPG and Liters Per KM, and can optionally apply a lifecycle profile to account for how fuel economy changes as vehicles age.
• The software automatically converts mixed units to a common base unit for calculations and can assist users in converting values between units, such as from MPG to Liters/100 KM. Results can be reviewed in multiple units, including MPG (US and UK), Liters per 100 KM, or KW-hr per 100 KM for electric and hydrogen/fuel cell vehicles.
• LEAP calculates stock average fuel economy based on the on-road fuel economy of new vehicles combined with data on vehicle stocks, sales, and survival. To ensure accurate base year stock average values, users are encouraged to specify historical fuel economy values using the Time-Series wizard to create an Interp function; otherwise, the software assumes the base year value applies to all previous years.

APA

Stockholm Environment Institute (n.d.). Fuel Economy. https://leap.sei.org/help24/Demand/Fuel_Economy.htm?agt=index

Chicago

Stockholm Environment Institute. Fuel Economy. n.d. https://leap.sei.org/help24/Demand/Fuel_Economy.htm?agt=index.

Wikipedia

{{cite report |author=Stockholm Environment Institute |title=Fuel Economy |url=https://leap.sei.org/help24/Demand/Fuel_Economy.htm?agt=index |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{stockholmenvironmentinstitutendfuel, author = {{Stockholm Environment Institute}}, title = {{Fuel Economy}}, institution = {Stockholm Environment Institute}, url = {https://leap.sei.org/help24/Demand/Fuel_Economy.htm?agt=index}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }