The global microchip shortage has resulted in numerous production cuts and limited availability for a number of features on new GM vehicles, as GM Authority has covered in the past. That includes the removal of automatic engine-stop start from GM’s line of full-size trucks and SUVs. We’ve already examined how the feature’s removal affects the fuel mileage of the 2021 Chevy Silverado 1500 and 2021 GMC Sierra 1500, and now, we’re taking a look at how the removal of automatic engine stop-start affects mpg figures for the 2021 Chevy Suburban.
For those readers who may not know, automatic engine stop-start is designed to increase fuel economy and lower emissions by cutting the engine as soon as a vehicle comes to a stop, including at a stop sign, stop light, or in traffic. Once the driver removes their foot from the brake pedal, the engine will automatically spark back to life, allowing the driver to progress forward.
However, due to the global microchip shortage, this feature has been removed from some new 2021 Chevy Suburban models, namely those equipped with the naturally aspirated 6.2L V8 L87 gasoline engine, which produces 420 horsepower at 5,600 rpm and 460 pound-feet of torque at 4,100 rpm. The 6.2L V8 L87 connects to a 10-speed automatic transmission, driving either the rear wheels, or all four wheels.
As of June 7th, 2021, new 2021 Chevy Suburban models equipped with the naturally aspirated 6.2L V8 L87 gasoline engine are no longer equipped with automatic engine stop-start. As a result, fuel economy is down by 1 mpg in the city, with rear-wheel drive models rated at 14 mpg in the metric and 4WD models rated at 13 mpg in the metric. Combined mpg for rear-wheel drive models is also down by 1 mpg.
Additionally, new 2021 Chevy Suburban models equipped with the naturally 5.3L V8 L84 which were produced after June 7th, 2021 also see a fuel economy decrease without automatic engine stop-start, losing 1 mpg in the city and 1 mpg combined when equipped with rear-wheel drive, and losing 1 mpg combined when equipped with four-wheel drive.
|Drivetrain||Engine||Transmission||Auto Stop/Start||City mpg||Highway mpg||Combined mpg||Effective Date|
|2WD||5.3L V8 L84||10-speed auto||Yes||16||20||18||Start of 2021 MY|
|2WD||5.3L V8 L84||10-speed auto||No||15||20||17||June 7, 2021|
|4WD||5.3L V8 L84||10-speed auto||Yes||15||19||17||Start of 2021 MY|
|4WD||5.3L V8 L84||10-speed auto||No||15||19||16||June 7, 2021|
|2WD||6.2L V8 L87||10-speed auto||Yes||15||20||17||Start of 2021 MY|
|2WD||6.2L V8 L87||10-speed auto||No||14||20||16||June 7, 2021|
|4WD||6.2L V8 L87||10-speed auto||Yes||14||19||16||Start of 2021 MY|
|4WD||6.2L V8 L87||10-speed auto||No||13||19||16||June 7, 2021|
|2WD||Turbodiesel 3.0L I6 LM2||10-speed auto||Yes||21||27||23||Start of 2021 MY|
|4WD||Turbodiesel 3.0L I6 LM2||10-speed auto||Yes||20||26||22||Start of 2021 MY|