2020 GMC Sierra 2WDFuel Economy & MPG Ratings
Diesel Standard Pickup Trucks 2WDRear-Wheel Drive
City
23
MPG
Highway
30
MPG
Combined
26
MPG
Trim Comparison
Automatic 10-spd
Diesel Diesel
City
23
Hwy
30
Comb
26
Fuel cost: $3,250/yr
Automatic 8-spd
Regular
City
20
Hwy
23
Comb
21
Fuel cost: $3,200/yr
Automatic 8-spd
Regular
City
17
Hwy
24
Comb
20
Fuel cost: $3,400/yr
Automatic 8-spd
Regular
City
19
Hwy
22
Comb
20
Fuel cost: $3,400/yr
Automatic 8-spd
Regular
City
17
Hwy
23
Comb
19
Fuel cost: $3,550/yr
Automatic 6-spd
Regular
City
15
Hwy
21
Comb
17
Fuel cost: $3,950/yr
Automatic 6-spd
Regular
City
16
Hwy
21
Comb
17
Fuel cost: $3,950/yr
Automatic 6-spd
Gasoline or E85 FFV
City
15
Hwy
19
Comb
16
Fuel cost: $4,200/yr
| Trim | Engine | City | Hwy | Combined | Fuel Cost/yr |
|---|---|---|---|---|---|
| Automatic 10-spd | Diesel Diesel | 23 | 30 | 26 | $3,250 |
| Automatic 8-spd | Regular | 20 | 23 | 21 | $3,200 |
| Automatic 8-spd | Regular | 17 | 24 | 20 | $3,400 |
| Automatic 8-spd | Regular | 19 | 22 | 20 | $3,400 |
| Automatic 8-spd | Regular | 17 | 23 | 19 | $3,550 |
| Automatic 6-spd | Regular | 15 | 21 | 17 | $3,950 |
| Automatic 6-spd | Regular | 16 | 21 | 17 | $3,950 |
| Automatic 6-spd | Gasoline or E85 FFV | 15 | 19 | 16 | $4,200 |
Annual Fuel Cost
$3,250
Based on gasoline at $3.67/gal, 15,000 miles/year
5-Year Fuel Savings
$-4,250
vs. average new vehicle
EPA Fuel Economy Score: 5/10
GHG Score: 5/10
Environment
- CO₂ Tailpipe Emissions
- 392 g/mile
- Annual Petroleum Consumption
- 13.7 barrels
Specifications
- Engine
- 5.3L 6-cyl
- Transmission
- 6-speed Automatic
- Drivetrain
- RWD
- Body Style
- Pickup Truck
- GVWR
- Class 2-3 (6,001–10,000 lbs)
Source: EPA fuel economy data & NHTSA vPIC. Specifications reflect the most common trim configuration.
Engine & Efficiency Details
Source: EPA fueleconomy.gov
- Engine Size
- 3L, 6-cylinder
- Efficiency Tech
- Auto Start-Stop
- Fuel Type
- Diesel
Annual Fuel Cost by State
Prices as of week ending May 18, 2026 · Source: EIA
National AvgEPA default
$4.490/gal$2,590/yr
California
$5.957/gal$3,437/yr
Texas
$3.888/gal$2,243/yr
Florida
$4.136/gal$2,386/yr
New York
$4.522/gal$2,609/yr
Ohio
$4.510/gal$2,602/yr
Washington
$5.591/gal$3,226/yr
Colorado
$4.618/gal$2,664/yr
Minnesota
$4.344/gal$2,506/yr
Massachusetts
$4.448/gal$2,566/yr
| State | Gas Price | Annual Cost | vs. National Avg |
|---|---|---|---|
| National AvgEPA default | $4.490/gal | $2,590/yr | — |
| California | $5.957/gal | $3,437/yrHIGHEST | +$847 |
| Texas | $3.888/gal | $2,243/yrLOWEST | $-347 |
| Florida | $4.136/gal | $2,386/yr | $-204 |
| New York | $4.522/gal | $2,609/yr | +$19 |
| Ohio | $4.510/gal | $2,602/yr | +$12 |
| Washington | $5.591/gal | $3,226/yr | +$636 |
| Colorado | $4.618/gal | $2,664/yr | +$74 |
| Minnesota | $4.344/gal | $2,506/yr | $-84 |
| Massachusetts | $4.448/gal | $2,566/yr | $-24 |
Calculated at 15,000 miles/year (EPA standard assumption) using 26 MPG combined. Regular gasoline prices. Actual costs vary.
Recall History
Source: NHTSA✓No recalls reported for this vehicle.
Related
GMC Sierra 2WD MPG History
See how this model's fuel economy changed by year