2021 Audi A8 EPA Fuel Economy Summary

The 2021 Audi A8 delivers an EPA-certified 18–21 MPG combined (15–17 city / 23–26 highway depending on engine and drivetrain) across 3 configurations. Plug-in hybrid (PHEV) models offer up to 18 miles of all-electric range at 53 MPGe. Estimated annual fuel costs range from $3,300 to $4,200.

Combined MPG
18–21 MPG
55% city / 45% highway weighted
City MPG
15–17 MPG
Stop-and-go urban cycle
Highway MPG
23–26 MPG
Sustained open-highway test
Annual Fuel Cost
$3,300–4,200
EPA estimate @ 15,000 miles/yr

2021 Audi A8 Powertrain & Efficiency Comparison

Factual efficiency differences across gasoline, hybrid, plug-in hybrid, and electric variants

Gas-Electric Hybrid

Hybrid (HEV) Trims

18–21 MPG Combined

Annual Fuel Cost: $3,600–$4,200

Plug-In Hybrid

Plug-In Hybrid (PHEV)

18 mi EV Range • 53 MPGe

Gasoline Combined: 23 MPG • Annual Energy Cost: $3,300

Official EPA Fuel Economy Ratings by Configuration (3 Variants)

Laboratory certification test values across engine, transmission, and drivetrain permutations

Configuration / Model Powertrain Drivetrain Transmission City Highway Combined EV Range Annual Fuel Cost CO2 (g/mi)
A8 L Premium and Electricity 3L Plug-in Hybrid All-Wheel Drive Automatic (S8) 49 MPGe (21 MPG) 60 MPGe (26 MPG) 53 MPGe (23 MPG) 18 mi $3,300 —
A8 L Premium 3L Hybrid All-Wheel Drive Automatic (S8) 17 MPG 26 MPG 21 MPG — $3,600 —
A8 L Premium 4L Hybrid All-Wheel Drive Automatic (S8) 15 MPG 23 MPG 18 MPG — $4,200 —
EPA Test Methodology: Fuel economy estimates are determined by vehicle manufacturers in accordance with EPA regulations (40 CFR Part 600) and verified by EPA laboratories. Estimates assume 15,000 miles per year of driving (55% city, 45% highway) at prevailing fuel and electricity prices.

Deterministic Fuel Cost & Consumption Benchmarks

Standardized annual energy consumption and operating cost metrics based on 15,000 annual miles

Fuel Cost per 25 Miles

$4.17–$4.86

Based on $3.50 per gallon regular gasoline

Annual Fuel Consumption

714–833 Gallons

Estimated annual energy units needed for 15,000 miles

5-Year Fuel Cost vs Avg Vehicle

Official EPA Benchmark

Compared to the average new vehicle over 5 years

Related Official Reports for 2021 Audi A8

Cross-reference safety ratings, owner defect complaints, and recall campaigns

Official US Government Data Provenance

Fuel economy ratings, electric range figures, and energy cost estimates on this page are retrieved directly from the United States Environmental Protection Agency (EPA) and U.S. Department of Energy (FuelEconomy.gov) certified vehicle database.

Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.