Vehicle data sources and licensing
The official and open datasets behind DragGap, what each source proves, and where modelled estimates begin.
U.S. EPA FuelEconomy.gov
The primary configuration feed covers EPA-certified U.S. passenger cars and light trucks from model year 1984 onward. DragGap uses its year, make, model, engine displacement, cylinders, transmission, drivetrain, fuel type and certified economy fields. Read the EPA service documentation.
NHTSA vPIC
The Vehicle Product Information Catalog cross-checks modern make, model, year and vehicle-type identity using manufacturer-submitted U.S. data. Read the vPIC API documentation.
Open Vehicle Specs supplement
The vehicle-makes-models repository supplies global generation and engine fields under the Open Database License 1.0. Supplemental matches are clearly labelled and never presented as EPA-certified measurements.
Instrumented QA benchmark
There is no trustworthy, complete, openly licensed bulk database of stock quarter-mile tests. For quality assurance, DragGap maintains a small source-linked set of factual results published by Car and Driver’s testing team. Its documented procedure uses Racelogic VBOX GPS logging and consistent vehicle preparation. This benchmark validates the simulator; it is not republished as the catalogue and DragGap never labels simulated times as measured results.
Coverage limitation
No free database contains every global trim together with verified power, weight, aerodynamics, stock top speed and instrumented acceleration. DragGap therefore labels provenance at field level and provides a verified-spec editor for vehicles outside provider coverage.