Based on data from 168 vehicles, 10,669 fuel-ups and 3,084,648 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 16.29 with a 0.06 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (6) 5.3L V8 ELECTRIC/GAS (11) 5.3L V8 FLEX (24) 5.3L V8 GAS (82) 6.2L V8 GAS (45) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (10) Crew Cab Pickup (47) Cab & Chassis - Crew Cab (1) Any Submodel Base (11) SLE (24) Denali (29) SLT (104)

Below you can see a distribution of the fuel-ups with 434 outliers (3.91%) removed.

Following shows the average MPG of each of the 168 vehicles in the system.

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• GMC Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 124 Fuel-ups

  Property of ndsewall

• 16.3 Avg MPG

• Jolene

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jul 2020 • 54 Fuel-ups

  Property of eddiemoney

• 17.1 Avg MPG

• Glenn

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2020 • 79 Fuel-ups

  Property of ghcrawford

• 15.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Jun 2018 • 62 Fuel-ups

  Property of yt_4real

• 13.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2021 • 20 Fuel-ups

  Property of maassen5995

• 19.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Feb 2019 • 96 Fuel-ups

  Property of turbonix

• 17.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Dec 2018 • 155 Fuel-ups

  Property of e37292

• 16.8 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 50 Fuel-ups

  Property of Teutonics

• 17.9 Avg MPG

• 2018 Sierra

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

  Property of elliston61

• 20.4 Avg MPG

• Gus’s Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added May 2019 • 142 Fuel-ups

  Property of enszc

• 14.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 FLEX Automatic 8 Speed
  Added Feb 2019 • 110 Fuel-ups

  Property of mpgapp

• 14.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 4.3L V6 FLEX Automatic 6 Speed
  Added Jan 2020 • 93 Fuel-ups

  Property of GregEscobar

• 19.1 Avg MPG

• Sierra All Terain

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 82 Fuel-ups

  Property of 76cj

• 19.1 Avg MPG

• Quicksilver

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jun 2020 • 64 Fuel-ups

  Property of tootall518

• 16.3 Avg MPG

• Rooster

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2019 • 47 Fuel-ups

  Property of x62605

• 16.9 Avg MPG

• Truck

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

  Property of DrAwesome

• 16.2 Avg MPG

• Black Betty

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Dec 2018 • 109 Fuel-ups

  Property of tlawson85

• 17.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2020 • 62 Fuel-ups

  Property of ianspecs

• 13.7 Avg MPG

• Sierra

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Oct 2018 • 99 Fuel-ups

  Property of ScottyR

• 13.9 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 212 Fuel-ups

  Property of jered6323

• 14.6 Avg MPG

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