Based on data from 186 vehicles, 16,496 fuel-ups and 4,657,620 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 239 outliers (1.43%) removed.

Following shows the average MPG of each of the 186 vehicles in the system.

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• Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added May 2021 • 110 Fuel-ups

  Property of gabeyoung

• 11.8 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 ELECTRIC/GAS Automatic 6 Speed
  Added Jun 2020 • 3 Fuel-ups

  Property of mjb2288

• 16.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Jul 2022 • 66 Fuel-ups

  Property of bertt34

• 15.7 Avg MPG

• Jimmy

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Jan 2018 • 204 Fuel-ups

  Property of cowpen

• 19.0 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Oct 2018 • 184 Fuel-ups

  Property of bgrinder90

• 14.0 Avg MPG

• My Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Apr 2022 • 43 Fuel-ups

  Property of cheapguy99

• 12.4 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Sep 2022 • 13 Fuel-ups

  Property of conan05

• 13.3 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Extended Cab Pickup
  Added Jun 2018 • 116 Fuel-ups

  Property of JDubz313

• 15.5 Avg MPG

• Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed Crew Cab Pickup
  Added Apr 2019 • 372 Fuel-ups

  Property of CAHayes1109

• 13.9 Avg MPG

• Gus’s Denali

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added May 2019 • 200 Fuel-ups

  Property of enszc

• 15.0 Avg MPG

• Jolene

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jul 2020 • 162 Fuel-ups

  Property of eddiemoney

• 17.1 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 8 Speed
  Added Sep 2018 • 323 Fuel-ups

  Property of Polar800

• 13.9 Avg MPG

• GMC Sierra 1500

  2018 GMC Sierra 1500 Denali 6.2L V8 GAS Automatic 8 Speed
  Added Jun 2018 • 207 Fuel-ups

  Property of ndsewall

• 16.2 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 FLEX Automatic 6 Speed
  Added Apr 2018 • 208 Fuel-ups

  Property of rleitht

• 15.0 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 5.3L V8 GAS Automatic 6 Speed
  Added Oct 2022 • 163 Fuel-ups

  Property of Mstc

• 15.5 Avg MPG

• My Sierra 1500

  2018 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 6 Speed
  Added Jan 2020 • 127 Fuel-ups

  Property of retiredcb

• 18.9 Avg MPG

• Truck

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added May 2018 • 169 Fuel-ups

  Property of DrAwesome

• 16.2 Avg MPG

• 2018 GMC Sierra

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 6 Speed
  Added Apr 2022 • 149 Fuel-ups

  Property of rtsteen

• 17.7 Avg MPG

• Truck

  2018 GMC Sierra 1500 4.3L V6 FLEX Automatic 6 Speed Standard Cab Pickup
  Added May 2019 • 7 Fuel-ups

  Property of mcgannd

• 24.8 Avg MPG

• 2018GMC SIERRA 4X4

  2018 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed Crew Cab Pickup
  Added Feb 2020 • 90 Fuel-ups

  Property of jjz3

• 19.0 Avg MPG

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