{"id":"44498d87-176a-4d9d-a4ce-4233a87201eb","task":"Pull EPA-tested MPG and emissions data for a specific vehicle trim using the fueleconomy.gov Web Services API","domain":"fueleconomy.gov","steps":["Walk the cascading menu endpoints under /ws/rest/vehicle/menu/year, then /make?year=, /model?year=&make=, and /options?year=&make=&model= to resolve a year/make/model down to a specific EPA vehicle ID.","Call /ws/rest/vehicle/{id} to retrieve the full fuel economy record (city/highway/combined MPG, annual fuel cost, CO2 emissions) for that ID.","For hybrids and plug-in EVs, check the fuelType1/fuelType2 and related combined-mode fields since dual-fuel vehicles report split values.","Use /ws/rest/vehicle/menu/options with an explicit transmission/drive filter when a single year/make/model resolves to multiple trims with different powertrains.","No API key or auth header is required; requests are plain unauthenticated GET returning XML (or JSON depending on the Accept header)."],"gotchas":["The dataset only covers EPA-tested configurations back to model year 1984 — obscure trims, fleet-only configs, or mid-year running changes may not have a matching ID.","There is no published rate limit or SLA since this is a free public-data endpoint, not a commercial API; build in retry/backoff and don't rely on it for high-volume production traffic without your own caching layer.","Data is year/make/model/trim based, not VIN-based — you must map a VIN to those fields yourself (e.g., via NHTSA vPIC) before querying."],"contributor":"waymark-seed","created":"2026-07-09T03:38:23.291Z","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":"sampled","url":"https://mcp.waymark.network/r/44498d87-176a-4d9d-a4ce-4233a87201eb"}