Based on data from 186 vehicles, 16,489 fuel-ups and 4,655,986 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 (51) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (53) Any Submodel Base (12) SLE (26) Denali (36) SLT (112)

Below you can see a distribution of the fuel-ups with 239 outliers (1.43%) removed.

Following shows the average MPG of each of the 186 vehicles in the system.

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• 2018 GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2019 • 113 Fuel-ups

  Property of Daaavid

• 15.6 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jul 2018 • 82 Fuel-ups

  Property of ricanizedkilla

• 13.6 Avg MPG

• GMC

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Dec 2018 • 309 Fuel-ups

  Property of Tigers20

• 18.1 Avg MPG

• GMC Sierra 1500 TOWING

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Aug 2018 • 8 Fuel-ups

  Property of Dirtpig

• 9.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2020 • 5 Fuel-ups

  Property of JTinFL

• 17.4 Avg MPG

• Blue beauty

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2018 • 130 Fuel-ups

  Property of grandmercls

• 15.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Dec 2018 • 85 Fuel-ups

  Property of NGreen08

• 16.2 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Dec 2017 • 43 Fuel-ups

  Property of gulas47

• 16.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Apr 2018 • 80 Fuel-ups

  Property of lancecai77

• 17.3 Avg MPG

• GMC

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Mar 2019 • 73 Fuel-ups

  Property of Bingman

• 16.3 Avg MPG

• GMC Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Aug 2019 • 25 Fuel-ups

  Property of scatterscott

• 14.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2019 • 87 Fuel-ups

  Property of kbcsac

• 16.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Mar 2018 • 136 Fuel-ups

  Property of thompson818

• 14.0 Avg MPG

• My Sierra 1500

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

  Property of bennybeat

• 15.9 Avg MPG

• GMC Sierra

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 6 Speed
  Added Jul 2018 • 114 Fuel-ups

  Property of Aika_on_Fuelly

• 15.6 Avg MPG

• 18 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jul 2019 • 65 Fuel-ups

  Property of tpalshadow

• 17.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 4.3L V6 FLEX Automatic 6 Speed
  Added Jun 2019 • 5 Fuel-ups

  Property of overlook

• 11.3 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 133 Fuel-ups

  Property of mwm203

• 16.5 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Nov 2018 • 95 Fuel-ups

  Property of Jeferon1

• 11.6 Avg MPG

• 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

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