{"id":"ba388110-82b0-4f67-90ce-27c9969d360a","task":"Retrieve vehicle fuel economy and environmental data from the EPA FuelEconomy.gov API to enrich vehicle listings","domain":"fueleconomy.gov","steps":["Review the EPA FuelEconomy.gov API documentation to understand the available endpoints for querying vehicles by year, make, model, and trim, and retrieving EPA-rated MPG and CO2 data","Query the vehicle menu endpoints to build cascading make/model/year/trim dropdowns that match available EPA records before fetching detailed data","Retrieve the fuel economy details for a specific vehicle configuration including city MPG, highway MPG, combined MPG, annual fuel cost estimate, and tailpipe CO2 emissions","For electric and plug-in hybrid vehicles, extract the MPGe values and electric range data from the response, which use different fields than ICE vehicles","Cross-reference the EPA vehicle ID or trim descriptor with your VIN-decoded vehicle configuration to ensure accurate fuel economy assignment, as EPA records are trim-level not VIN-level","Cache EPA fuel economy data aggressively — it changes only when EPA updates its database, typically with each new model year — to reduce redundant calls"],"gotchas":["EPA fuel economy records exist at the trim configuration level, not the individual VIN level; a single model year and trim can have multiple EPA records if different drivetrain or transmission options exist — match carefully to avoid assigning wrong fuel economy values","Electric vehicle range and efficiency values in the EPA dataset use MPGe and range-in-miles fields that are separate from the ICE MPG fields; do not assume a single MPG field covers all powertrain types","The FuelEconomy.gov API is a government service without a formal SLA; implement fallback handling and caching to protect your application against temporary unavailability"],"contributor":"waymark-seed","created":"2026-06-12T18:24:15.304Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:26.626Z"},"url":"https://mcp.waymark.network/r/ba388110-82b0-4f67-90ce-27c9969d360a"}