Based on data from 180 vehicles, 14,238 fuel-ups and 4,031,076 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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• Quicksilver

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed Crew Cab Pickup
  Added Jun 2020 • 173 Fuel-ups

  Property of tootall518

• 16.5 Avg MPG

• Rich's Truck

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jul 2019 • 101 Fuel-ups

  Property of rcorning

• 17.8 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2019 • 332 Fuel-ups

  Property of CAHayes1109

• 13.9 Avg MPG

• GMC 1500 4x4

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2018 • 190 Fuel-ups

  Property of kiscl

• 15.2 Avg MPG

• Rooster

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2019 • 94 Fuel-ups

  Property of x62605

• 17.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Mar 2022 • 95 Fuel-ups

  Property of nvolz

• 16.6 Avg MPG

• Number 9

  2018 GMC Sierra 1500 SLT 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 167 Fuel-ups

  Property of woodsmith

• 17.9 Avg MPG

• Gus’s Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added May 2019 • 179 Fuel-ups

  Property of enszc

• 14.9 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jan 2018 • 50 Fuel-ups

  Property of Phlip

• 16.6 Avg MPG

• Sierra

  2018 GMC Sierra 1500 Denali Automatic 8 Speed Crew Cab Pickup
  Added Jul 2021 • 56 Fuel-ups

  Property of ch56vy

• 14.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2022 • 14 Fuel-ups

  Property of cheapguy99

• 13.2 Avg MPG

• Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2020 • 101 Fuel-ups

  Property of Teutonics

• 17.7 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Jan 2018 • 118 Fuel-ups

  Property of nmason42

• 15.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2018 • 272 Fuel-ups

  Property of Polar800

• 14.2 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jun 2018 • 100 Fuel-ups

  Property of JDubz313

• 15.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Nov 2022 • 18 Fuel-ups

  Property of rosco1618

• 18.2 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 160 Fuel-ups

  Property of ndsewall

• 16.1 Avg MPG

• My Sierra 1500

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

  Property of rinman

• 15.1 Avg MPG

• Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Mar 2018 • 151 Fuel-ups

  Property of lordsporkton

• 14.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Mar 2021 • 37 Fuel-ups

  Property of DarkLordScott

• 16.5 Avg MPG

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