Based on data from 186 vehicles, 16,496 fuel-ups and 4,657,620 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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• My Sierra 1500

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

  Property of lcastrey

• 16.9 Avg MPG

• My Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jul 2018 • 16 Fuel-ups

  Property of changedman

• 30.4 Avg MPG

• Stonewood

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2018 • 45 Fuel-ups

  Property of Stonewood

• 17.0 Avg MPG

• 2018 Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 8 Speed
  Added Feb 2019 • 20 Fuel-ups

  Property of Mikecompton

• 15.8 Avg MPG

• 2018 GMC Sierra SLT

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Nov 2017 • 91 Fuel-ups

  Property of FriskyLingo

• 15.7 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Sep 2018 • 19 Fuel-ups

  Property of SpeedyD

• 16.5 Avg MPG

• Black Sierra

  2018 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Aug 2018 • 27 Fuel-ups

  Property of GaGolfSup

• 15.8 Avg MPG

• GMC Sierra

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Standard Cab Pickup
  Added Apr 2021 • 53 Fuel-ups

  Property of Twiese

• 15.5 Avg MPG

• Bo’s Sierra SLT

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Mar 2018 • 66 Fuel-ups

  Property of boewing1

• 16.7 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2019 • 6 Fuel-ups

  Property of 71sbeetle

• 16.3 Avg MPG

• Betty

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2018 • 42 Fuel-ups

  Property of and_steve

• 15.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2018 • 31 Fuel-ups

  Property of sessionh

• 15.0 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2018 • 33 Fuel-ups

  Property of yogi-bear

• 16.2 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2018 • 8 Fuel-ups

  Property of iamryanash

• 15.8 Avg MPG

• My Sierra 1500

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

  Property of cat71leg

• 15.1 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Dec 2018 • 8 Fuel-ups

  Property of iamryanash

• 15.8 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Dec 2018 • 8 Fuel-ups

  Property of iamryanash

• 15.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2018 • 20 Fuel-ups

  Property of canesnhlfan

• 17.9 Avg MPG

• Sierra

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

  Property of Rimshot

• 22.1 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2018 • 4 Fuel-ups

  Property of mws4ua

• 13.8 Avg MPG

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