Based on data from 195 vehicles, 18,103 fuel-ups and 5,116,612 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 15.96 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 (95) 6.2L V8 GAS (55) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (54) Any Submodel Base (12) SLE (30) Denali (41) SLT (112)

Below you can see a distribution of the fuel-ups with 255 outliers (1.39%) removed.

Following shows the average MPG of each of the 195 vehicles in the system.

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• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2024 • 46 Fuel-ups

  Property of o_dog2003

• 16.1 Avg MPG

• Rooster

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2019 • 145 Fuel-ups

  Property of x62605

• 17.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added May 2024 • 98 Fuel-ups

  Property of Zebby76

• 16.8 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2023 • 54 Fuel-ups

  Property of Jhs4

• 14.2 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2018 • 382 Fuel-ups

  Property of Godofwine7

• 15.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2018 • 232 Fuel-ups

  Property of rleitht

• 15.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2019 • 372 Fuel-ups

  Property of iNative

• 15.9 Avg MPG

• Big Red Eskimo

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Nov 2021 • 273 Fuel-ups

  Property of rkfdwc1

• 15.5 Avg MPG

• Black Betty

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Dec 2018 • 337 Fuel-ups

  Property of tlawson85

• 18.2 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 378 Fuel-ups

  Property of Buckshot48

• 17.9 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2019 • 435 Fuel-ups

  Property of CAHayes1109

• 14.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 246 Fuel-ups

  Property of cbinnie22

• 15.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2018 • 169 Fuel-ups

  Property of nmason42

• 15.0 Avg MPG

• Sierra

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Oct 2018 • 191 Fuel-ups

  Property of ScottyR

• 13.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jun 2024 • 20 Fuel-ups

  Property of richardcfo

• 20.6 Avg MPG

• Babs (Barbara) 2018 Sierra 1500 Denali

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

  Property of nicklebyrd20210

• 15.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2024 • 92 Fuel-ups

  Property of Mr-GreenToCleanPools

• 18.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2021 • 189 Fuel-ups

  Property of riggity27

• 14.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2023 • 52 Fuel-ups

  Property of bsimmons86

• 13.0 Avg MPG

• Vador

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Apr 2024 • 54 Fuel-ups

  Property of drink2006

• 18.6 Avg MPG

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