Based on data from 193 vehicles, 17,916 fuel-ups and 5,064,382 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 15.97 with a 0.05 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (6) 5.3L V8 ELECTRIC/GAS (10) 5.3L V8 FLEX (28) 5.3L V8 GAS (94) 6.2L V8 GAS (54) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (54) Any Submodel Base (12) SLE (30) Denali (40) SLT (111)

Below you can see a distribution of the fuel-ups with 246 outliers (1.35%) removed.

Following shows the average MPG of each of the 193 vehicles in the system.

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• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2018 • 229 Fuel-ups

  Property of rleitht

• 15.1 Avg MPG

• GMC Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Oct 2022 • 62 Fuel-ups

  Property of ArtieBar64

• 16.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2020 • 132 Fuel-ups

  Property of retiredcb

• 18.8 Avg MPG

• Truck

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2020 • 195 Fuel-ups

  Property of jasonbrakhage

• 14.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2023 • 48 Fuel-ups

  Property of bsimmons86

• 13.0 Avg MPG

• Quicksilver

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jun 2020 • 263 Fuel-ups

  Property of tootall518

• 16.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2021 • 185 Fuel-ups

  Property of riggity27

• 14.9 Avg MPG

• Vador

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Apr 2024 • 47 Fuel-ups

  Property of drink2006

• 18.6 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 372 Fuel-ups

  Property of Buckshot48

• 17.9 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Extended Cab Pickup
  Added May 2018 • 464 Fuel-ups

  Property of joenrox

• 16.6 Avg MPG

• Rich's Truck

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jul 2019 • 162 Fuel-ups

  Property of rcorning

• 18.2 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2019 • 424 Fuel-ups

  Property of CAHayes1109

• 14.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2024 • 85 Fuel-ups

  Property of Mr-GreenToCleanPools

• 18.4 Avg MPG

• My Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2022 • 63 Fuel-ups

  Property of cheapguy99

• 12.7 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2024 • 28 Fuel-ups

  Property of Jathroo

• 16.2 Avg MPG

• Big Red Eskimo

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Nov 2021 • 268 Fuel-ups

  Property of rkfdwc1

• 15.5 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 454 Fuel-ups

  Property of jered6323

• 14.3 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2018 • 69 Fuel-ups

  Property of Phlip

• 16.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2023 • 76 Fuel-ups

  Property of Harvey4335

• 15.2 Avg MPG

• Rooster

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2019 • 141 Fuel-ups

  Property of x62605

• 17.5 Avg MPG

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