2025 GMC Sierra 1500 Engine Specs

With four robust GMC Sierra 1500 engine options, there’s a full-size truck with the output you want at Sullivan Buick GMC. We’ll take a look at all of the 2025 GMC Sierra 1500 specs so you can get the overall feel for what this full-size truck has in store for your The Villages and Williston adventures. Are you putting a priority on the GMC Sierra 1500 towing capacity, or are you more concerned with the GMC Sierra 1500 mpg rating? We have all the stats you need to make it easy to choose your next truck. Once you’ve decided on your Sierra 1500, check our new vehicle specials for great offers on your favorite models.

2025 GMC Sierra 1500 Engine Options

In total, there are four powertrains for our Dunnellon neighbors to consider. The 2025 GMC Sierra 1500 towing capacity and other GMC Sierra 1500 specs vary, depending on which engine you equip your Sierra with. Let’s compare the 2025 GMC Sierra 1500 engine specs and trim compatibility for each powertrain: 

2.7L TurboMax™ I4 Engine

Available On: Pro, SLE, Elevation

• Horsepower: 310 hp
• Torque: 430 lb-ft
• Max Towing Capacity: 9,500 pounds
• Transmission: 8-speed automatic transmission

5.3L EcoTec3 V8 Gas Engine

Available On: Pro, SLE, Elevation, SLT. Denali

• Horsepower: 355 hp
• Torque: 383 lb-ft
• Max Towing Capacity: 11,200 pounds
• Transmission: 10-speed automatic transmission

Duramax® 3.0L Turbo Diesel I6 Engine

Available On: SLE, Elevation, SLT, Denali, AT4, AT4X, Denali Ultimate

• Horsepower: 305 hp
• Torque: 495 lb-ft
• Max Towing Capacity: 13,200 pounds
• Transmission: 10-speed automatic transmission

6.2L EcoTec3 V8 Gas Engine

Available On: SLT, Denali, AT4, AT4X, Denali Ultimate

• Horsepower: 420 hp
• Torque: 460 lb-ft
• Max Towing Capacity: 13,000 pounds
• Transmission: 10-speed automatic transmission

2025 GMC Sierra 1500 MPG Ratings 

While the 2025 GMC Sierra 1500 engine options are remarkably powerful, you’ll be surprised when you view the GMC Sierra 1500 mpg ratings below. They’re exceptionally efficient for the half-ton truck segment. 

• Pro: 18 mpg city/21 mpg highway
• SLE: 18 mpg city/21 mpg highway
• Elevation: 18 mpg city/21 mpg highway
• SLT: 16 mpg city/20 mpg highway
• AT4: 22 mpg city/26 mpg highway
• Denali: 16 mpg city/20 mpg highway
• AT4X: 19 mpg city/20 mpg highway
• Denali Ultimate: 15 mpg city/19 mpg highway

Experience the 2025 GMC Sierra 1500 Engine Options! 

There’s no better way to choose your favorite from the GMC Sierra 1500 engine options than with a test drive at Sullivan Buick GMC. Contact us today to schedule a time, or just stop by our showroom. Our sales associates will be happy to help you get behind the wheel of your favorite GMC Sierra 1500. When you find the one you’re after, apply for financing with us to speed up the buying process. We’ll return with the best loan rates available to you in no time flat.