Based on data from 195 vehicles, 18,086 fuel-ups and 5,111,781 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 15.96 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 255 outliers (1.39%) removed.

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

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• Sierra

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Oct 2018 • 191 Fuel-ups

  Property of ScottyR

• 13.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2024 • 45 Fuel-ups

  Property of o_dog2003

• 16.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jun 2024 • 20 Fuel-ups

  Property of richardcfo

• 20.6 Avg MPG

• Babs (Barbara) 2018 Sierra 1500 Denali

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

  Property of nicklebyrd20210

• 15.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2024 • 92 Fuel-ups

  Property of Mr-GreenToCleanPools

• 18.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2021 • 189 Fuel-ups

  Property of riggity27

• 14.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed
  Added Nov 2023 • 52 Fuel-ups

  Property of bsimmons86

• 13.0 Avg MPG

• Vador

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Apr 2024 • 54 Fuel-ups

  Property of drink2006

• 18.6 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2019 • 434 Fuel-ups

  Property of CAHayes1109

• 14.0 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2023 • 53 Fuel-ups

  Property of Jhs4

• 14.2 Avg MPG

• Number 9

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 228 Fuel-ups

  Property of woodsmith

• 17.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added May 2024 • 97 Fuel-ups

  Property of Zebby76

• 16.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Jun 2024 • 22 Fuel-ups

  Property of deanhodder

• 18.1 Avg MPG

• Rich's Truck

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jul 2019 • 166 Fuel-ups

  Property of rcorning

• 18.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Mar 2018 • 249 Fuel-ups

  Property of chilly0999

• 16.4 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Nov 2024 • 3 Fuel-ups

  Property of limker

• 6.8 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jun 2018 • 134 Fuel-ups

  Property of JDubz313

• 15.6 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 455 Fuel-ups

  Property of jered6323

• 14.3 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Extended Cab Pickup
  Added May 2018 • 470 Fuel-ups

  Property of joenrox

• 16.7 Avg MPG

• Truck

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added May 2018 • 180 Fuel-ups

  Property of DrAwesome

• 16.3 Avg MPG

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