| Manufacturer Name | General Motors |
| Manufacturer Code | GMX |
| Car Class | 19 |
| Car Class Details | Special Purpose Vehicle cab chassis |
| Model Type (Manufacturer) | |
| Release Date | 10/4/2021 |
Engine Specifications
| Model Type | SIDI; |
| Engine Displacement | 5.3 liters |
| Number of Cylinders | 8 |
| Transmission | Auto(A8) |
| Aspiration Method | NA |
| Aspiration Description | Naturally Aspirated |
| Variable Valve Timing | Y |
| Variable Valve Timing Details | cam phaser |
| Variable Valve Lift | N |
| Cam-less Valvetrain? | N |
| Intake Valves/Cylinder | 1 |
| Exhaust Valves/Cylinder | 1 |
| Cylinder Deactivation | Y |
| Cylinder Deactivation Details | dynamic fuel management |
| Model Type | SIDI; |
EV / HEV
Fuel And Fuel Effiency
| Fuel Efficiency Rating (On Label) | 2 |
| Estimated Fuel Cost (Annual) | $2350 |
| Fuel Cost (Annual) - EPA Calculated | $2350 |
| Expected Fuel Cost Over Next 5 Years | $5250 |
| Gas Guzzler Description | Truck |
| Conventional Fuel Efficiency - City/Highway/Combo | 14 / 17 / 15 |
| Conventional Fuel Efficiency - City/Highway/Combo | 17.3962 / 20.1526 / 20.1526 (Unadjusted) |
| Max. Ethanol Percent | 10 |
| Fuel Type (Conventional) Details | Gasoline (Regular Unleaded Recommended) |
| Fuel Metering System | Spark Ignition Direct Injection |
| Engine Start/Stop System | Yes |
Transmission System
| Transmission | A |
| Description | Automatic |
| Number of Gears | 8 |
| Lockup Torque Converter | Y |
| Creeper Gear | N |
| Drive System | 4 |
| Drive Description | 4-Wheel Drive |
Misc.
| Recommended Oil Viscosity | 0W20 |
| Conventional Fuel CO2 Production City/Highway/Comb. | 648 / 518 / 589 |
Smog And Pollution
| Greehouse Gas (GHG) Score | 2 |
| Smog Rating Test Group | NGMXT05.3386 |
| Mfr. Smog Rating | 6 |
| Testing Method | Vehicle Specific 5-cycle label |
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