Based on data from 186 vehicles, 16,545 fuel-ups and 4,672,006 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 240 outliers (1.43%) removed.

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

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• THE White Beast

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2018 • 15 Fuel-ups

  Property of Ckiefer

• 14.0 Avg MPG

• Jimmy

  2018 GMC Sierra 1500 5.3L V8 FLEX Automatic 6 Speed Extended Cab Pickup
  Added Sep 2018 • 4 Fuel-ups

  Property of porcupine

• 16.7 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Standard Cab Pickup
  Added Jun 2018 • 22 Fuel-ups

  Property of Coronet

• 19.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2017 • 43 Fuel-ups

  Property of rckywil

• 16.5 Avg MPG

• SierraEassist

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

  Property of Tgs79

• 20.0 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2018 • 21 Fuel-ups

  Property of CyclingJunkie

• 15.8 Avg MPG

• 2018 Gmc Sierra Z71 Elevation

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2018 • 76 Fuel-ups

  Property of Rawilson

• 16.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2018 • 14 Fuel-ups

  Property of mattonthewater

• 17.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 8 Speed
  Added Dec 2017 • 23 Fuel-ups

  Property of jjdmmorris

• 14.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 8 Speed
  Added Apr 2018 • 23 Fuel-ups

  Property of cbrooke

• 19.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Mar 2018 • 15 Fuel-ups

  Property of F800GS

• 15.7 Avg MPG

• 2018 GMC Sierra 1500 SLE

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Sep 2018 • 4 Fuel-ups

  Property of kerrar

• 15.4 Avg MPG

• My Sierra 1500

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

  Property of gicantor

• 26.1 Avg MPG

• GMC 18

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Apr 2018 • 4 Fuel-ups

  Property of Beef56

• 21.2 Avg MPG

• Sierra ‘18

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2017 • 26 Fuel-ups

  Property of karldv

• 13.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2018 • 11 Fuel-ups

  Property of dbierman

• 17.5 Avg MPG

• Dad's Truck

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jul 2018 • 10 Fuel-ups

  Property of Jake57

• 13.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2018 • 14 Fuel-ups

  Property of bass685

• 15.9 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Mar 2018 • 5 Fuel-ups

  Property of handovdoom

• 16.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2018 • 25 Fuel-ups

  Property of mikepru

• 16.8 Avg MPG

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