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Chevy Silverado

2021 Silverado 1500 RST Crew Cab, Short Bed w/ 5.3L EcoTec3

vs.

202 Silverado 1500 RST Crew Cab, Short Bed w/ 3.0L Duramax
355 hp

Horsepower

277 hp
383 lb-ft

Torque

460 lb-ft
Up to 15 mpg city/22 mpg highway (w/ 2WD)

Max. Fuel Economy

Up to 23 mpg city/ 33 mpg highway
9,400 pounds (from the ball)

Towing Capacity

9,000 pounds (from the ball)
Yes

Tow/Haul Mode?

Yes

2021 Chevy Silverado 1500 RST: 3.0L I6 vs. 5.3L V8 Engines


Are you considering a new Chevrolet Silverado? If so, you’ll have a few engines available to you — two of which are the 3.0L Duramax diesel engine and the 5.3L EcoTec3 gas-powered V8 engine. Which engine is the better choice for your commutes around Tallahassee? To better illustrate their differences, we’ve compared the same model — the 2021 Chevy Silverado 1500 RST — and its figures when equipped with either engine. Compare these two powerful GM engines, so you can make an informed decision when you spring for a new truck! 

5.3L EcoTec3 V8 vs. 3.0L Duramax I6: Engine Figures 

When you compare the Duramax I6 and EcoTec3 V8 engines, you’ll notice some differences in horsepower, torque, and towing figures, as well as different transmissions. Below, we’ve compared the specs for the EcoTec3 and Duramax engines, as well as the towing abilities of the Silverado 1500 RST with either of these machines: 

5.3L EcoTec3 V8 Engine:

  • 355 hp 
  • 383 lb-ft of torque
  • 8-speed automatic transmission
  • Electronically controlled with overdrive

3.0L Duramax Turbo-Diesel I6 Engine:

  • 277 hp
  • 460 lb-ft of torque 
  • Paired with a 10-speed automatic transmission
  • Includes diesel exhaust brake system
  • 10-speed automatic transmission

With 4WD, a 3.23 gear ratio, and the 3.0L Duramax engine, the Chevy Silverado 1500 RST Crew Cab/Short Bed configuration has a maximum towing capacity from the ball of 9,000 pounds. The 3.0L Duramax engine more than pulls its weight. In fact, the RST with the 5.3L EcoTec3 V8 only tows about 400 more pounds than the RST with the Duramax (from the ball). For a smaller engine, the Duramax certainly packs a big punch! 

5.3L EcoTec V8 vs. 3.0L Duramax I6: Fuel Economy 

When compared to the 3.0L Duramax I6, the 5.3L EcoTec3 V8 is more powerful if we’re going by horsepower alone. However, when you compare the fuel economy specs of both engines, you’ll notice that the Duramax diesel is more fuel efficient:

2021 Chevy Silverado 1500 RST with 2WD: 

  • 3.0L Diesel Engine, Short Box: 23 mpg city/33 mpg highway 
  • 5.3L V8 Engine, Short Box: 15 mpg city/22 mpg highway 

2021 Chevy Silverado 1500 RST With 4WD: 

  • 3.0L Diesel Engine, Short Box: 22 mpg city/26 mpg highway 
  • 5.3L V8 Engine, Short Box: 14 mpg city/21 mpg highway

If you’re shopping for an engine that’s capable in its own right and offers impressive mpg ratings, the Duramax diesel is definitely in a category by itself.

Test Drive a Diesel-Powered Silverado 1500 at Bill Cramer Chevrolet Buick GMC 

Ready to experience the 3.0L Duramax or another GM engine behind the wheel of a Chevrolet? Contact us online or call us at 850-387-4030! We can answer any questions you may have about GM engines, their performance, and fuel economy. Additionally, we can help you schedule a test drive in the Panama City area!

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2251 W 23rd St
Panama City, FL 32405
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Contact Us

Main 850-387-4030 Sales 850-387-4030
2251 W 23rd St
Panama City, FL 32405
Glovebox
Bill Cramer Chevrolet Buick GMC 30.1886, -85.6935.