Based on data from 186 vehicles, 16,524 fuel-ups and 4,665,798 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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• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2023 • 41 Fuel-ups

  Property of Harvey4335

• 15.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Aug 2019 • 18 Fuel-ups

  Property of jessbeavers

• 25.7 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2018 • 259 Fuel-ups

  Property of gerickson24

• 13.9 Avg MPG

• Glenn

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2020 • 268 Fuel-ups

  Property of ghcrawford

• 14.9 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Oct 2023 • 19 Fuel-ups

  Property of Jhs4

• 15.1 Avg MPG

• Rich's Truck

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jul 2019 • 142 Fuel-ups

  Property of rcorning

• 18.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 8 Speed
  Added Nov 2018 • 222 Fuel-ups

  Property of epedro40

• 16.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2021 • 156 Fuel-ups

  Property of riggity27

• 14.9 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 426 Fuel-ups

  Property of jered6323

• 14.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 221 Fuel-ups

  Property of cbinnie22

• 15.6 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2021 • 111 Fuel-ups

  Property of gabeyoung

• 11.8 Avg MPG

• 2018 GMC Sierra Denali 4x4

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jun 2018 • 245 Fuel-ups

  Property of mpg01

• 17.2 Avg MPG

• My Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2022 • 45 Fuel-ups

  Property of cheapguy99

• 12.4 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 329 Fuel-ups

  Property of Buckshot48

• 17.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2018 • 209 Fuel-ups

  Property of rleitht

• 15.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Oct 2019 • 327 Fuel-ups

  Property of iNative

• 15.7 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2018 • 64 Fuel-ups

  Property of Phlip

• 16.8 Avg MPG

• Black Betty

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Dec 2018 • 298 Fuel-ups

  Property of tlawson85

• 18.1 Avg MPG

• Gus’s Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added May 2019 • 202 Fuel-ups

  Property of enszc

• 15.0 Avg MPG

• Jimmy

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2018 • 205 Fuel-ups

  Property of cowpen

• 19.0 Avg MPG

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