Based on data from 180 vehicles, 13,927 fuel-ups and 3,948,496 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 16.05 with a 0.06 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (6) 5.3L V8 ELECTRIC/GAS (10) 5.3L V8 FLEX (25) 5.3L V8 GAS (88) 6.2L V8 GAS (50) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (51) Any Submodel Base (11) SLE (25) Denali (35) SLT (109)

Below you can see a distribution of the fuel-ups with 210 outliers (1.49%) removed.

Following shows the average MPG of each of the 180 vehicles in the system.

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• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 349 Fuel-ups

  Property of jered6323

• 14.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2022 • 37 Fuel-ups

  Property of jasonellington

• 16.9 Avg MPG

• GMC Sierra 1500 2018

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2018 • 136 Fuel-ups

  Property of JLF52

• 18.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2022 • 130 Fuel-ups

  Property of Mstc

• 15.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2022 • 23 Fuel-ups

  Property of bertt34

• 16.8 Avg MPG

• Truck

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added May 2018 • 136 Fuel-ups

  Property of DrAwesome

• 16.1 Avg MPG

• Glenn

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2020 • 187 Fuel-ups

  Property of ghcrawford

• 14.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2019 • 201 Fuel-ups

  Property of iNative

• 15.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2018 • 154 Fuel-ups

  Property of wmdahler

• 17.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2018 • 258 Fuel-ups

  Property of Polar800

• 14.4 Avg MPG

• Big Red Eskimo

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Nov 2021 • 107 Fuel-ups

  Property of rkfdwc1

• 15.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Dec 2018 • 216 Fuel-ups

  Property of e37292

• 16.9 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 241 Fuel-ups

  Property of Buckshot48

• 17.6 Avg MPG

• 2018 GMC Sierra Denali 4x4

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2018 • 182 Fuel-ups

  Property of mpg01

• 16.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 8 Speed
  Added Nov 2018 • 158 Fuel-ups

  Property of epedro40

• 16.5 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2019 • 326 Fuel-ups

  Property of CAHayes1109

• 13.9 Avg MPG

• Truck

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2020 • 147 Fuel-ups

  Property of jasonbrakhage

• 14.2 Avg MPG

• Black Betty

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Dec 2018 • 199 Fuel-ups

  Property of tlawson85

• 18.0 Avg MPG

• Sierra

  2018 GMC Sierra 1500 Denali Automatic 8 Speed Crew Cab Pickup
  Added Jul 2021 • 53 Fuel-ups

  Property of ch56vy

• 14.0 Avg MPG

• Rooster

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2019 • 89 Fuel-ups

  Property of x62605

• 17.3 Avg MPG

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