Based on data from 111 vehicles, 2,209 fuel-ups and 845,992 miles of driving, the 2025 GMC Sierra 1500 gets a combined Avg MPG of 21.53 with a 0.25 MPG margin of error.

Any Engine Type DIESEL (1) L3 DIESEL (2) L4 GAS (3) L6 DIESEL (22) V6 DIESEL (3) V8 GAS (5) Any Body Style Crew Cab Pickup (27) Standard Cab Pickup (2) Cab & Chassis - Crew Cab (1) Cab & Chassis - Extended Cab (1) Any Submodel Denali (13) AT4X (16) Denali Ultimate (16) Elevation (18) SLT (19) Other (29)

Below you can see a distribution of the fuel-ups with 12 outliers (0.54%) removed.

Following shows the average MPG of each of the 111 vehicles in the system.

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• My Sierra 1500

  2025 GMC Sierra 1500 Denali Ultimate
  Added Nov 2025 • 33 Fuel-ups

  Property of jeffhuntsman

• 17.5 Avg MPG

• My Sierra 1500

  2025 GMC Sierra 1500 Denali
  Added Jan 2025 • 51 Fuel-ups

  Property of ValiantV

• 24.2 Avg MPG

• My Sierra 1500

  2025 GMC Sierra 1500 AT4 L3 DIESEL Automatic 10 Speed
  Added Dec 2025 • 5 Fuel-ups

  Property of Kolodyd90

• 25.8 Avg MPG

• Sean’s Truck

  2025 GMC Sierra 1500 AT4
  Added Jul 2025 • 24 Fuel-ups

  Property of scglinka

• 20.9 Avg MPG

• 2025 Denali

  2025 GMC Sierra 1500 Denali
  Added Nov 2025 • 18 Fuel-ups

  Property of mkirbitz

• 18.0 Avg MPG

• 2025 GMC Sierra 1500 Denali Ultimate

  2025 GMC Sierra 1500 Denali Ultimate
  Added Nov 2025 • 8 Fuel-ups

  Property of mpgarver

• 16.7 Avg MPG

• Pablo

  2025 GMC Sierra 1500 Denali Ultimate
  Added Aug 2025 • 17 Fuel-ups

  Property of cjel23

• 27.5 Avg MPG

• The Gray Ghost

  2025 GMC Sierra 1500 Denali Ultimate
  Added Jul 2025 • 35 Fuel-ups

  Property of myGrayGhost

• 23.6 Avg MPG

• Tabs Truck

  2025 GMC Sierra 1500 AT4X
  Added Sep 2025 • 16 Fuel-ups

  Property of wilsonam

• 17.0 Avg MPG

• 2025 Denali

  2025 GMC Sierra 1500 Denali
  Added May 2025 • 62 Fuel-ups

  Property of mich1989

• 16.4 Avg MPG

• Denali Ultimate

  2025 GMC Sierra 1500 Denali Ultimate L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2025 • 34 Fuel-ups

  Property of chipstien

• 23.0 Avg MPG

• My Sierra 1500

  2025 GMC Sierra 1500 SLT
  Added Aug 2025 • 26 Fuel-ups

  Property of penny3

• 18.2 Avg MPG

• GMC Sierra 1500

  2025 GMC Sierra 1500 Denali Ultimate L6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Jun 2025 • 9 Fuel-ups

  Property of JBISHOP

• 24.8 Avg MPG

• My Sierra 1500

  2025 GMC Sierra 1500 SLT
  Added Jan 2026 • 8 Fuel-ups

  Property of gravityze

• 18.8 Avg MPG

• 2025 GMC Sierra 1500 SLT

  2025 GMC Sierra 1500 SLT V6 DIESEL Automatic 10 Speed Crew Cab Pickup
  Added Aug 2025 • 23 Fuel-ups

  Property of Teddychk

• 24.2 Avg MPG

• AT4

  2025 GMC Sierra 1500 AT4 Automatic 10 Speed
  Added Feb 2023 • 22 Fuel-ups

  Property of fordfvr4evr

• 22.4 Avg MPG

• 2025 Sierra

  2025 GMC Sierra 1500 Denali
  Added Sep 2025 • 20 Fuel-ups

  Property of msova2

• 21.4 Avg MPG

• Sierra

  2025 GMC Sierra 1500 AT4
  Added May 2025 • 29 Fuel-ups

  Property of ACBNJ

• 25.3 Avg MPG

• My Sierra 1500

  2025 GMC Sierra 1500 SLT
  Added Mar 2025 • 60 Fuel-ups

  Property of Sanders417

• 20.3 Avg MPG

• My Sierra 1500

  2025 GMC Sierra 1500 SLT
  Added Apr 2025 • 41 Fuel-ups

  Property of Gasman09

• 23.5 Avg MPG

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