Based on data from 164 vehicles, 9,319 fuel-ups and 2,685,993 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 16.28 with a 0.06 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (7) 5.3L V8 ELECTRIC/GAS (11) 5.3L V8 FLEX (23) 5.3L V8 GAS (78) 6.2L V8 GAS (45) Any Body Style Standard Cab Pickup (3) Extended Cab Pickup (10) Crew Cab Pickup (49) Cab & Chassis - Crew Cab (1) Any Submodel Base (11) SLE (22) Denali (28) SLT (103)

Below you can see a distribution of the fuel-ups with 347 outliers (3.59%) removed.

Following shows the average MPG of each of the 164 vehicles in the system.

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• My New Toy

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jan 2019 • 51 Fuel-ups

  Property of widebody

• 16.4 Avg MPG

• Black Betty

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Dec 2018 • 93 Fuel-ups

  Property of tlawson85

• 17.6 Avg MPG

• Glenn

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Nov 2020 • 44 Fuel-ups

  Property of ghcrawford

• 14.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2019 • 69 Fuel-ups

  Property of iNative

• 15.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2020 • 27 Fuel-ups

  Property of ianspecs

• 13.7 Avg MPG

• 2018 Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Cab & Chassis - Crew Cab
  Added Apr 2018 • 183 Fuel-ups

  Property of iZoomie

• 17.8 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 83 Fuel-ups

  Property of bgrinder90

• 13.8 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2019 • 176 Fuel-ups

  Property of hubbd33

• 14.3 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Feb 2019 • 102 Fuel-ups

  Property of trentm

• 15.3 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 8 Speed Crew Cab Pickup
  Added Jan 2019 • 215 Fuel-ups

  Property of civicsiracer06

• 14.9 Avg MPG

• GMC

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Dec 2018 • 302 Fuel-ups

  Property of Tigers20

• 18.1 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Mar 2018 • 166 Fuel-ups

  Property of Existant69

• 13.1 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 8 Speed
  Added Jun 2018 • 134 Fuel-ups

  Property of Buckshot48

• 17.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 151 Fuel-ups

  Property of Chad08

• 15.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 8 Speed
  Added Nov 2018 • 93 Fuel-ups

  Property of epedro40

• 16.6 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2018 • 83 Fuel-ups

  Property of nmason42

• 15.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Nov 2018 • 85 Fuel-ups

  Property of emejay

• 19.4 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Extended Cab Pickup
  Added May 2018 • 198 Fuel-ups

  Property of joenrox

• 16.9 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Dec 2018 • 127 Fuel-ups

  Property of e37292

• 16.8 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 30 Fuel-ups

  Property of Teutonics

• 17.5 Avg MPG

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