Based on data from 200 vehicles, 16,671 fuel-ups and 5,488,762 miles of driving, the 2020 GMC Sierra 1500 gets a combined Avg MPG of 18.19 with a 0.08 MPG margin of error.

Any Engine Type 2.7L L4 GAS (9) 3.0L L6 DIESEL (89) 4.3L V6 GAS (1) 5.3L V8 GAS (56) 6.2L V8 GAS (42) Any Body Style Extended Cab Pickup (3) Crew Cab Pickup (51) Any Submodel Base (3) SLE (10) Elevation (28) Denali (37) SLT (48) AT4 (74)

Below you can see a distribution of the fuel-ups with 377 outliers (2.21%) removed.

Following shows the average MPG of each of the 200 vehicles in the system.

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• Sierra 1500 SLT

  2020 GMC Sierra 1500 SLT
  Added Jan 2020 • 476 Fuel-ups

  Property of bdenman

• 18.9 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 5.3L V8 GAS Automatic 10 Speed
  Added Feb 2024 • 53 Fuel-ups

  Property of Bigredcherokee

• 15.4 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 332 Fuel-ups

  Property of GRCubsfan

• 17.0 Avg MPG

• GMC Sierra 1500

  2020 GMC Sierra 1500 SLT 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Feb 2021 • 278 Fuel-ups

  Property of mcsgary

• 19.1 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Sep 2022 • 158 Fuel-ups

  Property of srlew

• 14.8 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Sep 2020 • 262 Fuel-ups

  Property of mbnereim

• 14.8 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added May 2025 • 5 Fuel-ups

  Property of cmLM2

• 23.9 Avg MPG

• Diesel Sierra 1500

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Oct 2020 • 107 Fuel-ups

  Property of Along411

• 23.3 Avg MPG

• 2020 GMC Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 8 Speed
  Added Sep 2020 • 197 Fuel-ups

  Property of jndelisl

• 17.2 Avg MPG

• HUNK

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Apr 2021 • 107 Fuel-ups

  Property of Smokeetr

• 18.7 Avg MPG

• Sierra

  2020 GMC Sierra 1500 Elevation
  Added Nov 2019 • 331 Fuel-ups

  Property of nightrock548

• 17.3 Avg MPG

• AT4

  2020 GMC Sierra 1500 AT4 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 193 Fuel-ups

  Property of riefej80

• 19.9 Avg MPG

• 2020 Sierra 1500

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed
  Added Apr 2025 • 18 Fuel-ups

  Property of mgoblue94

• 17.0 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 AT4 6.2L V8 GAS Automatic 10 Speed
  Added Apr 2020 • 301 Fuel-ups

  Property of mjp1850

• 14.1 Avg MPG

• My Sierra 1500

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 10 Speed
  Added Jan 2025 • 8 Fuel-ups

  Property of burnsy17

• 15.3 Avg MPG

• Truck

  2020 GMC Sierra 1500 Elevation 5.3L V8 GAS Automatic 9 Speed Extended Cab Pickup
  Added Aug 2020 • 225 Fuel-ups

  Property of Bw1881

• 14.7 Avg MPG

• Maxine

  2020 GMC Sierra 1500 SLT 3.0L L6 DIESEL Automatic 10 Speed
  Added Aug 2020 • 243 Fuel-ups

  Property of ItsMine

• 23.6 Avg MPG

• GMC Sierra

  2020 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 10 Speed Crew Cab Pickup
  Added Mar 2023 • 132 Fuel-ups

  Property of robertt656

• 17.4 Avg MPG

• Blanca

  2020 GMC Sierra 1500 Denali 3.0L L6 DIESEL Automatic 10 Speed
  Added Sep 2017 • 74 Fuel-ups

  Property of adolrn

• 17.7 Avg MPG

• The Duramax

  2020 GMC Sierra 1500 SLE 3.0L L6 DIESEL Automatic 10 Speed
  Added Jan 2021 • 151 Fuel-ups

  Property of Mijo123

• 20.8 Avg MPG

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