Based on data from 193 vehicles, 17,945 fuel-ups and 5,072,208 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 (28) 5.3L V8 GAS (94) 6.2L V8 GAS (54) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (54) Any Submodel Base (12) SLE (30) Denali (40) SLT (111)

Below you can see a distribution of the fuel-ups with 246 outliers (1.35%) removed.

Following shows the average MPG of each of the 193 vehicles in the system.

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• 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

• 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

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