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  • Sterling Metallic 2026 GMC Sierra 1500 AT4Sterling Metallic 2026 GMC Sierra 1500 AT4Sterling Metallic 2026 GMC Sierra 1500 AT4Sterling Metallic 2026 GMC Sierra 1500 AT4Sterling Metallic 2026 GMC Sierra 1500 AT4Sterling Metallic 2026 GMC Sierra 1500 AT4

    $68,490

    $2.8K

    MSRP $73,455

    Est. $1,290/mo

    Reynolds GMC

    4.6
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    West Covina, CA (20 mi)

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  • Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4

    $72,490

    $3.1K

    MSRP $75,655

    Est. $1,366/mo

    Reynolds GMC

    4.6
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    West Covina, CA (20 mi)

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  • Dune 2026 GMC Sierra 1500 AT4Dune 2026 GMC Sierra 1500 AT4Dune 2026 GMC Sierra 1500 AT4Dune 2026 GMC Sierra 1500 AT4Dune 2026 GMC Sierra 1500 AT4Dune 2026 GMC Sierra 1500 AT4

    $71,590

    MSRP $74,755

    Est. $1,349/mo

    Hardin Buick GMC

    4.6
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    Anaheim, CA (18 mi)
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  • Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4

    $76,775

    MSRP $76,775

    Est. $1,446/mo

    Penske Buick GMC of South Bay

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    Torrance, CA (12 mi)
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  • Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4

    $70,810

    MSRP $74,060

    Est. $1,334/mo

    Simpson Buick GMC of Buena Park

    4.8
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    Buena Park, CA (11 mi)
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  • Sterling Metallic 2026 GMC Sierra 1500 AT4Sterling Metallic 2026 GMC Sierra 1500 AT4Sterling Metallic 2026 GMC Sierra 1500 AT4Sterling Metallic 2026 GMC Sierra 1500 AT4Sterling Metallic 2026 GMC Sierra 1500 AT4Sterling Metallic 2026 GMC Sierra 1500 AT4

    $68,030

    MSRP $74,780

    Est. $1,282/mo

    Tustin Buick GMC

    3.0
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    Tustin, CA (24 mi)
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  • 2026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT4

    $69,025

    MSRP $75,775

    Est. $1,300/mo

    Tustin Buick GMC

    3.0
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    Tustin, CA (24 mi)
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  • Coastal Dune 2026 GMC Sierra 1500 AT4Coastal Dune 2026 GMC Sierra 1500 AT4Coastal Dune 2026 GMC Sierra 1500 AT4Coastal Dune 2026 GMC Sierra 1500 AT4Coastal Dune 2026 GMC Sierra 1500 AT4Coastal Dune 2026 GMC Sierra 1500 AT4

    $72,985

    $3.1K

    MSRP $76,150

    Est. $1,375/mo

    Reynolds GMC

    4.6
    Check Availability
    West Covina, CA (20 mi)

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  • 2026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT4

    $69,030

    MSRP $73,780

    Est. $1,300/mo

    Tustin Buick GMC

    3.0
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    Tustin, CA (24 mi)
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  • 2026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT4

    $69,025

    MSRP $75,775

    Est. $1,300/mo

    Tustin Buick GMC

    3.0
    Check Availability
    Tustin, CA (24 mi)
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  • 2026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT4

    $68,635

    MSRP $73,385

    Est. $1,293/mo

    Tustin Buick GMC

    3.0
    Check Availability
    Tustin, CA (24 mi)
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  • Coastal Dune 2026 GMC Sierra 1500 AT4Coastal Dune 2026 GMC Sierra 1500 AT4Coastal Dune 2026 GMC Sierra 1500 AT4Coastal Dune 2026 GMC Sierra 1500 AT4Coastal Dune 2026 GMC Sierra 1500 AT4Coastal Dune 2026 GMC Sierra 1500 AT4

    $69,130

    MSRP $73,880

    Est. $1,302/mo

    Tustin Buick GMC

    3.0
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    Tustin, CA (24 mi)
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  • 2026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT4

    $69,130

    MSRP $73,880

    Est. $1,302/mo

    Tustin Buick GMC

    3.0
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    Tustin, CA (24 mi)
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  • Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4

    $72,490

    $3.1K

    MSRP $75,655

    Est. $1,366/mo

    Reynolds GMC

    4.6
    Check Availability
    West Covina, CA (20 mi)

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  • 2026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT42026 GMC Sierra 1500 AT4

    $69,030

    MSRP $73,780

    Est. $1,300/mo

    Tustin Buick GMC

    3.0
    Check Availability
    Tustin, CA (24 mi)
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  • Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4

    $70,415

    $2.2K

    MSRP $72,665

    Est. $1,327/mo

    Costa Mesa GMC

    1.4
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    Costa Mesa, CA (22 mi)
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  • Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4

    $65,613

    MSRP $73,755

    Est. $1,236/mo

    Hardin Buick GMC

    4.6
    Check Availability
    Anaheim, CA (18 mi)
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  • Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4Onyx Black 2026 GMC Sierra 1500 AT4

    $68,030

    MSRP $74,780

    Est. $1,282/mo

    Tustin Buick GMC

    3.0
    Check Availability
    Tustin, CA (24 mi)
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  • Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4Summit White 2026 GMC Sierra 1500 AT4

    $59,852

    2,849 mi.
    Est. $1,128/mo

    Chevrolet of Culver City

    3.9
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    Culver City, CA (15 mi)
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  • Sterling Metallic 2026 GMC Sierra 1500 AT4

    $75,620

    Est. $1,425/mo

    Reynolds GMC

    4.6
    Check Availability
    West Covina, CA (20 mi)

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  • Coastal Dune 2026 GMC Sierra 1500 AT4

    $75,650

    MSRP $75,650

    Est. $1,425/mo

    Penske Buick GMC of South Bay

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    Torrance, CA (12 mi)
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  • Coastal Dune 2026 GMC Sierra 1500 AT4

    $73,095

    MSRP $76,345

    Est. $1,377/mo

    Penske Buick GMC of Cerritos

    4.4
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    Cerritos, CA (5 mi)
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  • Summit White 2026 GMC Sierra 1500 AT4

    $71,605

    MSRP $73,855

    Est. $1,349/mo

    Penske Buick GMC of Cerritos

    4.4
    Check Availability
    Cerritos, CA (5 mi)
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  • White 2026 GMC Sierra 1500 AT4White 2026 GMC Sierra 1500 AT4White 2026 GMC Sierra 1500 AT4White 2026 GMC Sierra 1500 AT4White 2026 GMC Sierra 1500 AT4White 2026 GMC Sierra 1500 AT4

    $61,998

    5,010 mi.
    Est. $1,168/mo

    CarMax Tuscaloosa

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    $1,499 delivery to Buena Park, CA (10 mi)
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  • Silver 2026 GMC Sierra 1500 AT4Silver 2026 GMC Sierra 1500 AT4Silver 2026 GMC Sierra 1500 AT4Silver 2026 GMC Sierra 1500 AT4Silver 2026 GMC Sierra 1500 AT4Silver 2026 GMC Sierra 1500 AT4

    $65,998

    $2K
    5,396 mi.
    Est. $1,243/mo

    CarMax Tinley Park

    Check Availability
    $1,599 delivery to Buena Park, CA (10 mi)
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About the 2026 GMC Sierra 1500 AT4

Basics

AT4 shown.

Seating
5
Door count
4
Drivetrain
Four Wheel Drive
Combined MPG
23
Transmission
10-Speed A/T
Engine
420.0-hp, 6.2-liter, 8 Cylinder Engine (Gasoline Fuel)
Side view of the 2026 GMC Sierra 1500 AT4
FAQs

How much does the 2026 GMC Sierra 1500 AT4 cost?

The 2026 GMC Sierra 1500 AT4 price depends on optional features. Prices typically start at $67,000.

What is the MPG of the 2026 GMC Sierra 1500 AT4?

The 2026 GMC Sierra 1500 AT4 offers up to 21 MPG in city driving and 24 MPG on the highway for a combined rating of 23 MPG.

These figures are based on EPA mileage ratings and are for comparison purposes only. The actual mileage will vary depending on the selected vehicle options, driving conditions, driving habits, vehicle maintenance, and other factors.

What are some similar vehicles and competitors of the 2026 GMC Sierra 1500 AT4?

The 2026 GMC Sierra 1500 AT4 compares to and/or competes against the following vehicles:


Is the 2026 GMC Sierra 1500 AT4 reliable?

The 2026 GMC Sierra 1500 has an average reliability rating of 4.5 out of 5 according to Cars.com consumers. Find real-world reliability insights within consumer reviews from 2026 Sierra 1500 owners.

Ratings (4 reviews)

75% of drivers recommend this car

Rating breakdown (out of 5):
Comfort
4.0
Interior
4.0
Performance
4.2
Value
3.5
Exterior
4.2
Reliability
4.5
Trims

AT4 (2 styles)

Style
4WD Crew Cab 147" AT4 4WD Crew Cab 157" AT4
Inventory price
Starting at $67,000 Starting at $67,500
Combined MPG
23 23
Engine
420.0-hp, 6.2-liter, 8 Cylinder Engine (Gasoline Fuel) 420.0-hp, 6.2-liter, 8 Cylinder Engine (Gasoline Fuel)
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2026 GMC Sierra 1500 AT4 by city

GMC Sierra 1500 trims