Based on data from 180 vehicles, 14,226 fuel-ups and 4,028,066 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 16.03 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 211 outliers (1.46%) removed.

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

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• Sierra All Terain

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 88 Fuel-ups

  Property of 76cj

• 19.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2020 • 73 Fuel-ups

  Property of ianspecs

• 13.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2021 • 21 Fuel-ups

  Property of maassen5995

• 19.4 Avg MPG

• 2018 Sierra Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Feb 2019 • 75 Fuel-ups

  Property of gfervin

• 14.8 Avg MPG

• Bluejay

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

  Property of Bigtrucker53

• 18.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 6 Speed
  Added Feb 2022 • 101 Fuel-ups

  Property of Ridley13

• 14.5 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2018 • 84 Fuel-ups

  Property of geeklife

• 17.7 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Feb 2019 • 121 Fuel-ups

  Property of trentm

• 15.5 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Nov 2018 • 75 Fuel-ups

  Property of Matt1552

• 20.1 Avg MPG

• 2018 Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2018 • 148 Fuel-ups

  Property of mkirbitz

• 16.7 Avg MPG

• 5.3L Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jul 2021 • 16 Fuel-ups

  Property of Corelax

• 15.5 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2019 • 215 Fuel-ups

  Property of hubbd33

• 14.8 Avg MPG

• 2018 GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2019 • 113 Fuel-ups

  Property of Daaavid

• 15.6 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jul 2018 • 82 Fuel-ups

  Property of ricanizedkilla

• 13.6 Avg MPG

• GMC

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Dec 2018 • 309 Fuel-ups

  Property of Tigers20

• 18.1 Avg MPG

• GMC Sierra 1500 TOWING

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Aug 2018 • 8 Fuel-ups

  Property of Dirtpig

• 9.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2019 • 12 Fuel-ups

  Property of jessbeavers

• 24.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2020 • 5 Fuel-ups

  Property of JTinFL

• 17.4 Avg MPG

• Blue beauty

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2018 • 130 Fuel-ups

  Property of grandmercls

• 15.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Dec 2018 • 85 Fuel-ups

  Property of NGreen08

• 16.2 Avg MPG

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