Based on data from 180 vehicles, 14,226 fuel-ups and 4,028,066 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 16.03 with a 0.06 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (6) 5.3L V8 ELECTRIC/GAS (10) 5.3L V8 FLEX (25) 5.3L V8 GAS (88) 6.2L V8 GAS (50) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (9) Crew Cab Pickup (51) Any Submodel Base (11) SLE (25) Denali (35) SLT (109)

Below you can see a distribution of the fuel-ups with 211 outliers (1.46%) removed.

Following shows the average MPG of each of the 180 vehicles in the system.

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• 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

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2018 • 27 Fuel-ups

  Property of brettsinyard

• 14.0 Avg MPG

• BKMX120

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2018 • 13 Fuel-ups

  Property of bkeating

• 15.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 FLEX Automatic 8 Speed
  Added Mar 2018 • 5 Fuel-ups

  Property of hornedfrog05

• 18.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Feb 2018 • 3 Fuel-ups

  Property of dail0054

• 11.6 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Jul 2021 • 122 Fuel-ups

  Property of Bigtrucker53

• 17.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Oct 2017 • 5 Fuel-ups

  Property of cburley

• 16.9 Avg MPG

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