Based on data from 193 vehicles, 18,699 fuel-ups and 5,280,025 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 15.93 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 (29) 5.3L V8 GAS (92) 6.2L V8 GAS (55) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (51) Any Submodel Base (12) SLE (30) Denali (41) SLT (110)

Below you can see a distribution of the fuel-ups with 266 outliers (1.40%) removed.

Following shows the average MPG of each of the 193 vehicles in the system.

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• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 258 Fuel-ups

  Property of cbinnie22

• 15.4 Avg MPG

• Number 9

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 236 Fuel-ups

  Property of woodsmith

• 17.5 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Extended Cab Pickup
  Added May 2018 • 492 Fuel-ups

  Property of joenrox

• 16.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2018 • 232 Fuel-ups

  Property of wmdahler

• 17.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2022 • 188 Fuel-ups

  Property of Mstc

• 15.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2023 • 59 Fuel-ups

  Property of bsimmons86

• 12.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Mar 2018 • 262 Fuel-ups

  Property of chilly0999

• 16.5 Avg MPG

• Babs (Barbara) 2018 Sierra 1500 Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Nov 2024 • 21 Fuel-ups

  Property of nicklebyrd20210

• 13.9 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2021 • 146 Fuel-ups

  Property of gabeyoung

• 11.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Feb 2024 • 68 Fuel-ups

  Property of BowManGuardian

• 16.0 Avg MPG

• Jolene

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jul 2020 • 189 Fuel-ups

  Property of eddiemoney

• 17.0 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jun 2018 • 139 Fuel-ups

  Property of JDubz313

• 15.5 Avg MPG

• Truck

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added May 2018 • 188 Fuel-ups

  Property of DrAwesome

• 16.2 Avg MPG

• 2018 GMC Sierra Denali 4x4

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2018 • 286 Fuel-ups

  Property of mpg01

• 17.0 Avg MPG

• GMC Sierra 1500 2018

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2018 • 201 Fuel-ups

  Property of JLF52

• 18.8 Avg MPG

• My Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2022 • 71 Fuel-ups

  Property of cheapguy99

• 12.7 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 135 Fuel-ups

  Property of Teutonics

• 17.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2018 • 174 Fuel-ups

  Property of nmason42

• 15.1 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 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2024 • 32 Fuel-ups

  Property of deanhodder

• 17.5 Avg MPG

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