Following the release of an all-new fourth generation for the 2019 model year, the 2021 Chevy Silverado 1500 receives a few small changes and updates. What’s more, Silverado diesel models received a price drop at the end of the 2020 model year production run, which then carried over to the 2021 model year. Now, 2021 Chevy Silverado models equipped with 4WD and the Duramax diesel engine option post lower fuel economy ratings when compared to similarly equipped 2020 model year vehicles.
Looking over the latest fuel economy figures, we see that the 2021 Chevy Silverado 4WD diesel posts one fewer mpg in the city, three fewer mpg on the highway, and one fewer mpg combined. Meanwhile, there are no fuel economy differences between the 2020 Chevy Silverado 1500 2WD Duramax and 2021 Silverado 1500 2WD Duramax.
| Rating | 2021 MY | 2020 MY | Difference |
|---|---|---|---|
| City mpg | 23 | 23 | - |
| Highway mpg | 33 | 33 | - |
| Combined mpg | 27 | 27 | - |
| Rating | 2021 MY | 2020 MY | Difference |
|---|---|---|---|
| City mpg | 22 | 23 | -1 |
| Highway mpg | 26 | 29 | -3 |
| Combined mpg | 24 | 25 | -1 |
For reference, the engine in question is the 3.0L I6 LM2 Duramax, which produces 277 horsepower at 3,750 rpm and 460 pound-feet of torque at 1,500 rpm.
We reached out to General Motors for an explanation as to why the 2021 Chevy Silverado 4WD diesel fuel economy numbers decreased compared to the preceding 2020 model year. Here’s their answer:
“The 4WD 3.0L configuration went up in its test weight class, which led to slightly reduced fuel economy to 22 city/26 highway/24 combined,” General Motors told GM Authority. “The 2WD configuration remains best-in-class with 23 city/33 highway.”
We followed-up by asking GM about the weight gain alluded to for the 4WD 3.0L configuration. General Motors responded by telling GM Authority that it had to do with “higher contented truck being tested based on production schedule.”
As such, these slightly lower fuel economy ratings would, in theory, not reflect any real-world fuel economy losses for customers.
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October 13, 2020 at 01:34AM
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2021 Chevy Silverado 4WD Diesel Fuel Economy Ratings Drop - GM Authority
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