Based on data from 195 vehicles, 18,422 fuel-ups and 5,203,276 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 15.94 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 262 outliers (1.40%) removed.

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

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• Truck

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added May 2018 • 184 Fuel-ups

  Property of DrAwesome

• 16.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2018 • 226 Fuel-ups

  Property of wmdahler

• 17.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jun 2024 • 26 Fuel-ups

  Property of richardcfo

• 20.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2024 • 26 Fuel-ups

  Property of deanhodder

• 17.9 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 134 Fuel-ups

  Property of Teutonics

• 17.4 Avg MPG

• Number 9

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 231 Fuel-ups

  Property of woodsmith

• 17.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 FLEX Automatic 8 Speed
  Added Aug 2023 • 20 Fuel-ups

  Property of MaxBurn

• 12.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2018 • 135 Fuel-ups

  Property of rinman

• 15.3 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2023 • 59 Fuel-ups

  Property of Jhs4

• 14.1 Avg MPG

• Jolene

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jul 2020 • 186 Fuel-ups

  Property of eddiemoney

• 17.1 Avg MPG

• GMC Sierra 1500 2018

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2018 • 196 Fuel-ups

  Property of JLF52

• 18.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2020 • 133 Fuel-ups

  Property of retiredcb

• 18.8 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2018 • 71 Fuel-ups

  Property of Phlip

• 16.8 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Nov 2024 • 4 Fuel-ups

  Property of limker

• 6.8 Avg MPG

• Quicksilver

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jun 2020 • 267 Fuel-ups

  Property of tootall518

• 16.3 Avg MPG

• 033

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Mar 2024 • 42 Fuel-ups

  Property of jirpol

• 15.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2019 • 21 Fuel-ups

  Property of jessbeavers

• 28.1 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2018 • 288 Fuel-ups

  Property of gerickson24

• 14.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Jun 2020 • 3 Fuel-ups

  Property of mjb2288

• 16.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2022 • 82 Fuel-ups

  Property of bertt34

• 15.5 Avg MPG

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