2021 GMC Sierra 1500 Extended Cab Seating Capacity Specs
Seating Capacity Specs
| Seating Capacity | 6 passengers |
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| Doors | 4 |
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All Available Specs
Basics
| Year | 2021 |
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| Make | GMC |
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| Model | Sierra 1500 |
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| Trim | Extended Cab |
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| Vehicle Type | Truck |
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Seating & Access
Powertrain
| Engine | ECOTEC3 WITH AVAILABLE ACTIVE FUEL MANAGEMENT |
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| Engine Configuration | V8 |
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| Engine Size (L) | 5.3 L |
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| Engine Size (cu in) | 323 cu in |
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| Transmission | 8 Spd Auto, Electronically Controlled |
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| Drivetrain | 4WD |
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Power & Performance
| Horsepower | 355 HP |
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| Horsepower RPM | 5,600 rpm |
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| Torque | 383 ft-lbs |
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| Torque RPM | 4,100 rpm |
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| HP/Liter | 66 HP/L |
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| HP/Cubic Inch | 1.1 HP/cu in |
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Fuel Efficiency
| City MPG | 14 mpg |
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| City L/100km | 17.0 L/100km |
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| Highway MPG | 20 mpg |
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| Highway L/100km | 12.0 L/100km |
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| Combined MPG | 17 mpg |
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| Combined L/100km | 14.0 L/100km |
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Fuel Tank & Range
| Gas Tank Size (gal) | 24.0 gal |
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| Gas Tank Size (L) | 90.8 L |
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| City Range (miles) | 336 miles |
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| City Range (km) | 541 km |
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| Highway Range (miles) | 480 miles |
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| Highway Range (km) | 772 km |
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| Combined Range (miles) | 408 miles |
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| Combined Range (km) | 657 km |
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Tires
| Front Tire Size | 255/70R17 |
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| Front Tire Width | 255 |
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| Front Tire Aspect Ratio | 70 |
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| Front Rim Size | 17 |
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| Rear Tire Size | 255/70R17 |
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| Rear Tire Width | 255 |
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| Rear Tire Aspect Ratio | 70 |
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| Rear Rim Size | 17 |
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| Spare Tire Size | 255/70R17 |
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Wheels
| Front Wheel Size | 17 x 8.0 |
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| Rear Wheel Size | 17 x 8.0 |
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| Front Wheel Material | Steel |
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| Rear Wheel Material | Steel |
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Legroom
| First Row Legroom (in) | 44 in. |
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| First Row Legroom (cm) | 111 cm |
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| Second Row Legroom (in) | 35 in. |
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| Second Row Legroom (cm) | 88 cm |
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Headroom
| First Row Headroom (in) | 43 in. |
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| First Row Headroom (cm) | 109 cm |
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| Second Row Headroom (in) | 39 in. |
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| Second Row Headroom (cm) | 99 cm |
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Turning Measurements
| Turning Diameter C2C (ft) | 46.3 ft |
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| Turning Diameter C2C (m) | 14.1 m |
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| Turning Radius C2C (ft) | 23.1 ft |
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| Turning Radius C2C (m) | 7.0 m |
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Ground Clearance
| Front Ground Clearance (in) | 8.1 in. |
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| Front Ground Clearance (cm) | 20.6 cm |
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| Rear Ground Clearance (in) | 8.1 in. |
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| Rear Ground Clearance (cm) | 20.6 cm |
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| Min Ground Clearance (in) | 8.1 in. |
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| Min Ground Clearance (cm) | 20.6 cm |
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| Max Ground Clearance (in) | 8.1 in. |
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| Max Ground Clearance (cm) | 20.6 cm |
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Height & Length
| Height (in) | 75 in. |
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| Height (cm) | 190 cm |
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| Height (ft) | 6.3 ft |
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| Height (m) | 1.9 m |
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| Length (in) | 231 in. |
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| Length (cm) | 586 cm |
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| Length (ft) | 19.3 ft |
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| Length (m) | 5.9 m |
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Width & Track
| Width w/o Mirrors (in) | 81.2 in. |
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| Width w/o Mirrors (cm) | 206 cm |
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| Width w/o Mirrors (ft) | 6.8 ft |
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| Width w/o Mirrors (m) | 2.1 m |
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Wheelbase
| Wheelbase (in) | 147 in. |
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| Wheelbase (cm) | 373 cm |
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| Wheelbase (ft) | 12.3 ft |
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| Wheelbase (m) | 3.7 m |
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