Based on data from 186 vehicles, 16,489 fuel-ups and 4,655,986 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 (27) 5.3L V8 GAS (91) 6.2L V8 GAS (51) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (53) Any Submodel Base (12) SLE (26) Denali (36) SLT (112)

Below you can see a distribution of the fuel-ups with 239 outliers (1.43%) removed.

Following shows the average MPG of each of the 186 vehicles in the system.

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• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 FLEX Automatic 8 Speed
  Added Apr 2018 • 81 Fuel-ups

  Property of msova2

• 14.7 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 8 Speed Crew Cab Pickup
  Added Jan 2019 • 309 Fuel-ups

  Property of civicsiracer06

• 14.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Nov 2018 • 124 Fuel-ups

  Property of emejay

• 19.4 Avg MPG

• Company Truck

  2018 GMC Sierra 1500 4.3L V6 FLEX Automatic 6 Speed Standard Cab Pickup
  Added Feb 2019 • 115 Fuel-ups

  Property of RhoadBlock

• 15.5 Avg MPG

• My New Toy

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jan 2019 • 82 Fuel-ups

  Property of widebody

• 16.9 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2018 • 180 Fuel-ups

  Property of Existant69

• 13.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added May 2020 • 29 Fuel-ups

  Property of nkeller32

• 18.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 4.3L V6 FLEX Automatic 6 Speed
  Added Jan 2020 • 101 Fuel-ups

  Property of GregEscobar

• 19.1 Avg MPG

• 18 GMC

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2021 • 50 Fuel-ups

  Property of oldguy123

• 18.9 Avg MPG

• 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

• 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

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