Based on data from 165 vehicles, 10,195 fuel-ups and 2,942,762 miles of driving, the 2018 GMC Sierra 1500 gets a combined Avg MPG of 16.27 with a 0.06 MPG margin of error.

Any Engine Type 4.3L V6 FLEX (6) 5.3L V8 ELECTRIC/GAS (11) 5.3L V8 FLEX (22) 5.3L V8 GAS (81) 6.2L V8 GAS (45) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (10) Crew Cab Pickup (48) Cab & Chassis - Crew Cab (1) Any Submodel Base (11) SLE (23) Denali (29) SLT (102)

Below you can see a distribution of the fuel-ups with 372 outliers (3.52%) removed.

Following shows the average MPG of each of the 165 vehicles in the system.

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• 2018 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Nov 2018 • 92 Fuel-ups

  Property of gerickson24

• 14.2 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 8 Speed Crew Cab Pickup
  Added Jan 2019 • 246 Fuel-ups

  Property of civicsiracer06

• 14.7 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jun 2018 • 76 Fuel-ups

  Property of JDubz313

• 15.6 Avg MPG

• Sierra Red

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2019 • 103 Fuel-ups

  Property of Snafujg

• 16.2 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2018 • 233 Fuel-ups

  Property of Godofwine7

• 16.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2018 • 111 Fuel-ups

  Property of rleitht

• 15.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 4.3L V6 FLEX Automatic 6 Speed
  Added Jan 2020 • 88 Fuel-ups

  Property of GregEscobar

• 19.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Dec 2020 • 50 Fuel-ups

  Property of ianspecs

• 13.8 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 117 Fuel-ups

  Property of ndsewall

• 16.5 Avg MPG

• Sierra All Terain

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 72 Fuel-ups

  Property of 76cj

• 18.9 Avg MPG

• Jolene

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jul 2020 • 42 Fuel-ups

  Property of eddiemoney

• 16.8 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 42 Fuel-ups

  Property of Teutonics

• 17.7 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2019 • 183 Fuel-ups

  Property of jered6323

• 15.3 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2018 • 86 Fuel-ups

  Property of nmason42

• 15.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 5.3L V8 GAS Automatic 8 Speed
  Added May 2020 • 22 Fuel-ups

  Property of nkeller32

• 16.8 Avg MPG

• Gus’s Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added May 2019 • 136 Fuel-ups

  Property of enszc

• 14.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2018 • 165 Fuel-ups

  Property of Polar800

• 15.1 Avg MPG

• 2018 Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Cab & Chassis - Crew Cab
  Added Apr 2018 • 194 Fuel-ups

  Property of iZoomie

• 17.8 Avg MPG

• 2018 Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Feb 2019 • 121 Fuel-ups

  Property of trentm

• 15.5 Avg MPG

• GMC 1500 4x4

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2018 • 135 Fuel-ups

  Property of kiscl

• 14.9 Avg MPG

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