Based on data from 25 vehicles, 1,147 fuel-ups and 412,426 miles of driving, the 1999 GMC K1500 Suburban gets a combined Avg MPG of 13.07 with a 0.16 MPG margin of error.

Any Engine Type 5.7L V8 GAS (22) 6.5L V8 DIESEL (1) V8 GAS (2) Any Body Style Sport Utility (12) Any Submodel SLE (5) SLT (18) Other (2)

Below you can see a distribution of the fuel-ups with 27 outliers (2.30%) removed.

Following shows the average MPG of each of the 25 vehicles in the system.

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• Suburban

  1999 GMC K1500 Suburban SLE 5.7L V8 GAS Automatic 4 Speed
  Added Mar 2017 • 200 Fuel-ups

  Property of f-pig

• 13.5 Avg MPG

• My K1500 Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed
  Added Dec 2024 • 4 Fuel-ups

  Property of NoTSkLd

• 10.0 Avg MPG

• 1999 K1500 Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed
  Added Jun 2022 • 16 Fuel-ups

  Property of wolson

• 6.7 Avg MPG

• John

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Dec 2018 • 251 Fuel-ups

  Property of jdendy4

• 11.4 Avg MPG

• Lucy

  1999 GMC K1500 Suburban SLT 6.5L V8 DIESEL Automatic 4 Speed
  Added Jun 2021 • 17 Fuel-ups

  Property of kybarker

• 17.8 Avg MPG

• My K1500 Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed
  Added Nov 2023 • 4 Fuel-ups

  Property of kbuecksler

• 24.7 Avg MPG

• My K1500 Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed
  Added Dec 2024 • 3 Fuel-ups

  Property of LMG8807

• 19.1 Avg MPG

• My K1500 Suburban

  1999 GMC K1500 Suburban SLE 5.7L V8 GAS Automatic 4 Speed
  Added Oct 2023 • 5 Fuel-ups

  Property of shayjames

• 9.0 Avg MPG

• Humpty Dumpty

  1999 GMC K1500 Suburban SLE 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Sep 2013 • 269 Fuel-ups

  Property of LazySpread

• 13.7 Avg MPG

• Paula The Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Dec 2017 • 72 Fuel-ups

  Property of rickras20

• 15.2 Avg MPG

• The Burban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed
  Added Dec 2021 • 16 Fuel-ups

  Property of SubieQ

• 12.7 Avg MPG

• GMC

  1999 GMC K1500 Suburban SLE 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Mar 2018 • 33 Fuel-ups

  Property of xfilesbuff

• 8.3 Avg MPG

• Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Aug 2020 • 21 Fuel-ups

  Property of brighnic

• 14.9 Avg MPG

• BK K1500 Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed
  Added Dec 2018 • 61 Fuel-ups

  Property of BKSubDriver

• 16.5 Avg MPG

• GMC Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Apr 2019 • 21 Fuel-ups

  Property of Tripitaka

• 14.1 Avg MPG

• Subby

  1999 GMC K1500 Suburban SLE 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added May 2018 • 5 Fuel-ups

  Property of nagann

• 17.3 Avg MPG

• Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Feb 2018 • 18 Fuel-ups

  Property of twiggles

• 12.7 Avg MPG

• Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Nov 2017 • 90 Fuel-ups

  Property of filthyllama

• 13.7 Avg MPG

• 99 Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Aug 2016 • 13 Fuel-ups

  Property of mistaake

• 12.2 Avg MPG

• The Beast

  1999 GMC K1500 Suburban GAS V8
  Added Aug 2011 • 9 Fuel-ups

  Property of milehighassassin

• 12.3 Avg MPG

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