2020 GMC Sierra 1500 EPA Fuel Economy Summary

The 2020 GMC Sierra 1500 delivers an EPA-certified 16–26 MPG combined (14–23 city / 18–30 highway depending on engine and drivetrain) across 22 configurations. Estimated annual fuel costs range from $2,950 to $4,450.

Combined MPG
16–26 MPG
55% city / 45% highway weighted
City MPG
14–23 MPG
Stop-and-go urban cycle
Highway MPG
18–30 MPG
Sustained open-highway test
Annual Fuel Cost
$2,950–4,450
EPA estimate @ 15,000 miles/yr

Official EPA Fuel Economy Ratings by Configuration (22 Variants)

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

Configuration / Model Powertrain Drivetrain Transmission City Highway Combined Annual Fuel Cost CO2 (g/mi)
Sierra 2WD Diesel 3L Turbo-Diesel Rear-Wheel Drive Automatic 10-spd 23 MPG 30 MPG 26 MPG $3,050 —
Sierra 4WD Diesel 3L Turbo-Diesel 4-Wheel Drive Automatic 10-spd 22 MPG 26 MPG 24 MPG $3,300 —
Sierra 4WD AT4 Diesel 3L Turbo-Diesel 4-Wheel Drive Automatic 10-spd 22 MPG 26 MPG 24 MPG $3,300 —
Sierra 2WD Regular 2.7L 4-Cyl Gas Rear-Wheel Drive Automatic 8-spd 20 MPG 23 MPG 21 MPG $2,950 —
Sierra 2WD Regular 2.7L 4-Cyl Gas Rear-Wheel Drive Automatic 8-spd 19 MPG 22 MPG 20 MPG $3,100 —
Sierra 4WD Regular 2.7L 4-Cyl Gas 4-Wheel Drive Automatic 8-spd 19 MPG 22 MPG 20 MPG $3,100 —
Sierra 4WD Regular 2.7L 4-Cyl Gas 4-Wheel Drive Automatic 8-spd 19 MPG 22 MPG 20 MPG $3,100 —
Sierra 2WD Regular 5.3L 8-Cyl Gas Rear-Wheel Drive Automatic 8-spd 17 MPG 24 MPG 20 MPG $3,100 —
Sierra 2WD Regular 5.3L 8-Cyl Gas Rear-Wheel Drive Automatic 8-spd 17 MPG 23 MPG 19 MPG $3,250 —
Sierra 4WD Regular 5.3L 8-Cyl Gas 4-Wheel Drive Automatic 10-spd 16 MPG 22 MPG 19 MPG $3,250 —
Sierra 4WD Regular 5.3L 8-Cyl Gas 4-Wheel Drive Automatic 8-spd 16 MPG 22 MPG 18 MPG $3,400 —
Sierra 4WD AT4 Regular 5.3L 8-Cyl Gas 4-Wheel Drive Automatic 8-spd 16 MPG 21 MPG 18 MPG $3,400 —
Sierra 4WD AT4 Regular 5.3L 8-Cyl Gas 4-Wheel Drive Automatic 10-spd 16 MPG 21 MPG 18 MPG $3,400 —
Sierra 2WD Regular 4.3L 6-Cyl Gas Rear-Wheel Drive Automatic 6-spd 16 MPG 21 MPG 17 MPG $3,600 —
Sierra 2WD Regular 5.3L 8-Cyl Gas Rear-Wheel Drive Automatic 6-spd 15 MPG 21 MPG 17 MPG $3,600 —
Sierra 4WD Premium 6.2L 8-Cyl Gas 4-Wheel Drive Automatic 10-spd 15 MPG 20 MPG 17 MPG $4,450 —
Sierra 4WD AT4 Premium 6.2L 8-Cyl Gas 4-Wheel Drive Automatic 10-spd 15 MPG 19 MPG 17 MPG $4,450 —
Sierra 4WD Regular 5.3L 8-Cyl Gas 4-Wheel Drive Automatic 6-spd 15 MPG 20 MPG 17 MPG $3,600 —
Sierra 4WD Regular 4.3L 6-Cyl Gas 4-Wheel Drive Automatic 6-spd 15 MPG 20 MPG 17 MPG $3,600 —
Sierra 2WD Gasoline or E85 5.3L 8-Cyl Gas Rear-Wheel Drive Automatic 6-spd 15 MPG 19 MPG 16 MPG $3,850 —
Sierra 4WD AT4 Regular 5.3L 8-Cyl Gas 4-Wheel Drive Automatic 6-spd 14 MPG 18 MPG 16 MPG $3,850 —
Sierra 4WD Gasoline or E85 5.3L 8-Cyl Gas 4-Wheel Drive Automatic 6-spd 14 MPG 19 MPG 16 MPG $3,850 —
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

$3.37–$5.47

Based on $3.50 per gallon regular gasoline

Annual Fuel Consumption

577–938 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 2020 GMC Sierra 1500

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.