Fuel Economy

The document provides technical instructions for using the Demand Branch Properties screen in LEAP to specify the fuel economy of newly purchased vehicles. It details the available units of measurement, the use of lifecycle profiles to account for vehicle aging, and the software's ability to automatically calculate stock average fuel economy based on sales and survival data. It also emphasizes the importance of entering historical fuel economy values to ensure accurate base year stock average calculations.

• Fuel economy in LEAP is defined as the energy consumption per unit of vehicle-distance traveled, or its inverse for miles per gallon (MPG). Users can specify data using various standard units, including US and UK MPG and Liters Per KM, and the software provides automatic conversion between these units.
• The software allows for the optional specification of a lifecycle profile to model how fuel economy degrades as vehicles age. For MPG data, this profile should be constant or decreasing, whereas for Liters per KM, it should be constant or increasing.
• LEAP automatically calculates the stock average fuel economy using the on-road fuel economy of new vehicles combined with data on vehicle stocks, sales, and survival. To ensure the base year stock average is accurate, users are advised to specify historical values using the Time-Series wizard.

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} }