2026 GMC Sierra 4WD (Flex Fuel)Fuel Economy & MPG Ratings
Trim Comparison
| Trim | Engine | City | Hwy | Combined | Fuel Cost/yr |
|---|---|---|---|---|---|
| Automatic 10-spd | Gasoline or E85 FFV | 15 | 19 | 17 | $3,950 |
Based on gasoline at $3.67/gal, 15,000 miles/year
vs. average new vehicle
Environment
- CO₂ Tailpipe Emissions
- 524 g/mile
- Annual Petroleum Consumption
- 17.5 barrels
Specifications
- Engine
- 5.3L 8-cyl
- Transmission
- 10-speed Automatic
- Drivetrain
- 4WD
- 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
- 5.3L, 8-cylinder
- Induction Type
- SIDI; FFV
- Fuel Type
- Regular Gasoline
- Alt Fuel
- E85
Annual Fuel Cost by State
Prices as of week ending May 18, 2026 · Source: EIA
| State | Gas Price | Annual Cost | vs. National Avg |
|---|---|---|---|
| National AvgEPA default | $4.490/gal | $3,962/yr | — |
| California | $5.957/gal | $5,256/yrHIGHEST | +$1,294 |
| Texas | $3.888/gal | $3,431/yrLOWEST | $-531 |
| Florida | $4.136/gal | $3,649/yr | $-313 |
| New York | $4.522/gal | $3,990/yr | +$28 |
| Ohio | $4.510/gal | $3,979/yr | +$17 |
| Washington | $5.591/gal | $4,933/yr | +$971 |
| Colorado | $4.618/gal | $4,075/yr | +$113 |
| Minnesota | $4.344/gal | $3,833/yr | $-129 |
| Massachusetts | $4.448/gal | $3,925/yr | $-37 |
Calculated at 15,000 miles/year (EPA standard assumption) using 17 MPG combined. Regular gasoline prices. Actual costs vary.
Recall History
Source: NHTSA✓No recalls reported for this vehicle.
Owner-Reported Problems43 complaints
Source: NHTSANHTSA has received 43 owner complaints for the 2026 GMC Sierra 4WD (Flex Fuel). Top reported issues include engine, power train and advanced safety (adas). The data below is sourced from consumer complaints filed directly with NHTSA.
Problems by System / Component
2026 GMC Sierra 4WD (Flex Fuel) problems by category: Engine: 28 complaints, Power Train: 14 complaints, Advanced Safety (ADAS): 6 complaints, Electrical System: 4 complaints, Brakes: 3 complaints, Fuel System: 3 complaints, Steering: 2 complaints, Structure: 1 complaints.
Sample Owner Complaints
Complaint data is sourced from the NHTSA Complaints Database. Reports are filed by vehicle owners and may not reflect confirmed defects. Last updated via NHTSA API.