Based on data from 187 vehicles, 16,581 fuel-ups and 4,682,233 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 (52) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (54) Any Submodel Base (12) SLE (26) Denali (37) SLT (112)

Below you can see a distribution of the fuel-ups with 240 outliers (1.43%) removed.

Following shows the average MPG of each of the 187 vehicles in the system.

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• SierraNutz

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 8 Speed Crew Cab Pickup
  Added Jul 2020 • 7 Fuel-ups

  Property of Jcook96

• 16.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2019 • 54 Fuel-ups

  Property of mbrent77

• 18.5 Avg MPG

• 2018 GMC

  2018 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Mar 2018 • 133 Fuel-ups

  Property of MurphyD

• 19.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Dec 2017 • 148 Fuel-ups

  Property of Hacjr1949

• 18.4 Avg MPG

• GMC Truck

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Extended Cab Pickup
  Added Mar 2019 • 85 Fuel-ups

  Property of JOlson

• 14.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Mar 2019 • 76 Fuel-ups

  Property of Tommyboy1

• 17.5 Avg MPG

• Noel

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 34 Fuel-ups

  Property of mkcollimsworth

• 17.8 Avg MPG

• 2018 GMC Sierra 1500 SLT

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2018 • 75 Fuel-ups

  Property of blkcheech

• 16.9 Avg MPG

• Little Red

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Nov 2018 • 64 Fuel-ups

  Property of llljrmd

• 16.8 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Dec 2018 • 122 Fuel-ups

  Property of wdclark

• 18.8 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed
  Added Jul 2020 • 8 Fuel-ups

  Property of riahkane

• 15.2 Avg MPG

• 2018 Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Nov 2017 • 90 Fuel-ups

  Property of bae1161

• 17.2 Avg MPG

• 2018 Sierra 1500 SLT

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Mar 2018 • 175 Fuel-ups

  Property of RickGMC

• 16.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2019 • 5 Fuel-ups

  Property of green02crew

• 12.9 Avg MPG

• Sierra Denali

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

  Property of PBU02

• 23.5 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLE 4.3L V6 FLEX Automatic 6 Speed
  Added Jan 2019 • 17 Fuel-ups

  Property of Ratater

• 15.5 Avg MPG

• Smokey

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2018 • 37 Fuel-ups

  Property of isobellacuan

• 16.9 Avg MPG

• Thomas

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2018 • 20 Fuel-ups

  Property of tomprzy

• 18.1 Avg MPG

• Sierra

  2018 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Sep 2018 • 24 Fuel-ups

  Property of pilule

• 17.6 Avg MPG

• My Sierra 1500

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

  Property of flopper666

• 31.9 Avg MPG

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