FuelEconomy.gov website screenshot

FuelEconomy.gov

US Department of Energy REST API providing official EPA fuel economy ratings, vehicle specifications, CO2 emissions data, and energy cost comparisons for all model years from 1984 to present. Administered by Oak Ridge National Laboratory for the DOE and EPA, the API offers free, unauthenticated access to vehicle lookup menus, per-vehicle MPG records, emissions data, current fuel prices, and community-contributed real-world fuel economy data.

FuelEconomy.gov publishes 6 APIs on the APIs.io network, including Emissions API, Fuel Prices API, Menus API, and 3 more. Tagged areas include Fuel Economy, EPA, DOE, Energy, and Vehicles.

The FuelEconomy.gov catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

FuelEconomy.gov’s developer surface includes documentation and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub
35.3/100 thin ▬ flat Agent 28/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreeOpen⚡ Free to try
6 APIs
Fuel EconomyEPADOEEnergyVehiclesEmissionsCO2MPGAutomotiveGovernmentOpen Data

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 35.3/100 · thin
Contract Quality 16.0 / 25
Developer Ergonomics 1.7 / 20
Commercial Clarity 5.8 / 20
Operational Transparency 0.0 / 13
Governance 7.0 / 12
Discoverability 7.4 / 10
Agent readiness — 28/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/fueleconomy: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 6

Individual APIs this provider publishes, each with its own machine-readable definition.

FuelEconomy.gov Emissions API

EPA tailpipe emissions data per vehicle

FuelEconomy.gov Fuel Prices API

Current US fuel prices used by the FuelEconomy.gov platform

FuelEconomy.gov Menus API

Navigation menus for year/make/model vehicle lookup

FuelEconomy.gov User MPG API

Community-contributed real-world MPG data

FuelEconomy.gov User MPG Menus API

Navigation menus for community MPG data lookup

FuelEconomy.gov Vehicles API

Retrieve EPA fuel economy and specifications for specific vehicles

Pricing Plans 1

Published pricing tiers and plan structures.

Fueleconomy Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Fueleconomy Rate Limits

0 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Fueleconomy Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Fueleconomy Context

7 classes · 75 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

FuelEconomy.gov API Rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 4

Standalone JSON Schema definitions for this provider's data models.

FuelPrices

8 properties

JSON SCHEMA

MenuItems

1 properties

JSON SCHEMA

Vehicle

65 properties

JSON SCHEMA

YmpgVehicle

7 properties

JSON SCHEMA

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Fueleconomy Domain Security

TLSv1.2 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Fueleconomy Agentic Access

12 operations

12 operations · 0 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits
RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans
Plans
 FinOps
FinOps

Company 2

The organization behind the API

Website
Website
 Newsletter
Newsletter

Other 2

Properties that don't map to a standard resource type

DataDownload
DataDownload
 Widgets
Widgets

Source (apis.yml)

apis.yml Raw ↑ 
aid: fueleconomy
name: FuelEconomy.gov
description: US Department of Energy REST API providing official EPA fuel economy ratings, vehicle specifications, CO2 emissions
  data, and energy cost comparisons for all model years from 1984 to present. Administered by Oak Ridge National Laboratory
  for the DOE and EPA, the API offers free, unauthenticated access to vehicle lookup menus, per-vehicle MPG records, emissions
  data, current fuel prices, and community-contributed real-world fuel economy data.
type: Index
accessModel:
  pricing: free
  onboarding: open
  trial: false
  try_now: true
  public: true
  label: Free · Open access
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/fueleconomy.png
url: https://raw.githubusercontent.com/api-evangelist/fueleconomy/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.19'
tags:
- Fuel Economy
- EPA
- DOE
- Energy
- Vehicles
- Emissions
- CO2
- MPG
- Automotive
- Government
- Open Data
apis:
- aid: fueleconomy:fueleconomy-emissions-api
  name: FuelEconomy.gov Emissions API
  description: EPA tailpipe emissions data per vehicle
  humanURL: https://www.fueleconomy.gov/feg/ws/index.shtml
  baseURL: https://www.fueleconomy.gov/ws/rest
  tags:
  - Emissions
  properties:
  - type: OpenAPI
    url: openapi/fueleconomy-emissions-api-openapi.yml
  - type: Documentation
    url: https://www.fueleconomy.gov/feg/ws/index.shtml
- aid: fueleconomy:fueleconomy-fuel-prices-api
  name: FuelEconomy.gov Fuel Prices API
  description: Current US fuel prices used by the FuelEconomy.gov platform
  humanURL: https://www.fueleconomy.gov/feg/ws/index.shtml
  baseURL: https://www.fueleconomy.gov/ws/rest
  tags:
  - Fuel Prices
  properties:
  - type: OpenAPI
    url: openapi/fueleconomy-fuel-prices-api-openapi.yml
  - type: Documentation
    url: https://www.fueleconomy.gov/feg/ws/index.shtml
- aid: fueleconomy:fueleconomy-menus-api
  name: FuelEconomy.gov Menus API
  description: Navigation menus for year/make/model vehicle lookup
  humanURL: https://www.fueleconomy.gov/feg/ws/index.shtml
  baseURL: https://www.fueleconomy.gov/ws/rest
  tags:
  - Menus
  properties:
  - type: OpenAPI
    url: openapi/fueleconomy-menus-api-openapi.yml
  - type: Documentation
    url: https://www.fueleconomy.gov/feg/ws/index.shtml
- aid: fueleconomy:fueleconomy-user-mpg-api
  name: FuelEconomy.gov User MPG API
  description: Community-contributed real-world MPG data
  humanURL: https://www.fueleconomy.gov/feg/ws/index.shtml
  baseURL: https://www.fueleconomy.gov/ws/rest
  tags:
  - User MPG
  properties:
  - type: OpenAPI
    url: openapi/fueleconomy-user-mpg-api-openapi.yml
  - type: Documentation
    url: https://www.fueleconomy.gov/feg/ws/index.shtml
- aid: fueleconomy:fueleconomy-user-mpg-menus-api
  name: FuelEconomy.gov User MPG Menus API
  description: Navigation menus for community MPG data lookup
  humanURL: https://www.fueleconomy.gov/feg/ws/index.shtml
  baseURL: https://www.fueleconomy.gov/ws/rest
  tags:
  - User MPG Menus
  properties:
  - type: OpenAPI
    url: openapi/fueleconomy-user-mpg-menus-api-openapi.yml
  - type: Documentation
    url: https://www.fueleconomy.gov/feg/ws/index.shtml
- aid: fueleconomy:fueleconomy-vehicles-api
  name: FuelEconomy.gov Vehicles API
  description: Retrieve EPA fuel economy and specifications for specific vehicles
  humanURL: https://www.fueleconomy.gov/feg/ws/index.shtml
  baseURL: https://www.fueleconomy.gov/ws/rest
  tags:
  - Vehicles
  properties:
  - type: OpenAPI
    url: openapi/fueleconomy-vehicles-api-openapi.yml
  - type: Documentation
    url: https://www.fueleconomy.gov/feg/ws/index.shtml
common:
- type: AgenticAccess
  url: agentic-access/fueleconomy-agentic-access.yml
- type: DomainSecurity
  url: security/fueleconomy-domain-security.yml
- type: Website
  url: https://www.fueleconomy.gov/
- type: Documentation
  url: https://www.fueleconomy.gov/feg/ws/index.shtml
- type: DataDownload
  url: https://www.fueleconomy.gov/feg/download.shtml
- type: Widgets
  url: https://www.fueleconomy.gov/widgets/
- type: Newsletter
  url: mailto:FuelEconomyNews-join@elist.ornl.gov
- type: Plans
  url: plans/fueleconomy-plans-pricing.yml
- type: RateLimits
  url: rate-limits/fueleconomy-rate-limits.yml
- type: FinOps
  url: finops/fueleconomy-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com