About
Data sources
Vehicle data on this site comes from two public U.S. government sources:
- EPA Fuel Economy Guide — fuel economy, vehicle class, and drive type for light-duty vehicles. This is the primary source.
- NHTSA vPIC API — manufacturer and model reference data.
Light-truck classification is derived from EPA vehicle-class fields, with additional context generated by an LLM pass for vehicles where the rule-based classification is ambiguous.
Why isn't my vehicle listed?
The EPA Fuel Economy Guide only covers vehicles that manufacturers are required to report under CAFE (Corporate Average Fuel Economy) standards. That generally means light-duty vehicles up to 8,500 lbs GVWR, plus Medium-Duty Passenger Vehicles up to 10,000 lbs GVWR.
Vehicles not included:
- Heavy-duty pickups — Ford F-250/350/450, Chevrolet Silverado 2500/3500, GMC Sierra 2500/3500, Ram 2500/3500, and similar
- Heavy-duty vans — Ford E-series cutaway, Transit 350 HD, Ram ProMaster 3500, Chevrolet Express / GMC Savana 2500/3500 in their HD configurations
- Heavy-duty SUVs over 10,000 lbs GVWR (e.g. the original Ford Excursion)
- Motorcycles, RVs, ATVs, and off-road vehicles — regulated under different programs
- Pre-1985 vehicles — coverage is incomplete
- Very-low-volume manufacturers — some exotic and small-batch makers don't report
Heavy-duty vehicles are regulated separately under EPA and NHTSA medium- and heavy-duty greenhouse-gas and fuel-efficiency programs, but that data isn't part of the Fuel Economy Guide and isn't included here. For the regulatory detail, see 49 CFR Part 600.