Based on data from 17 vehicles, 754 fuel-ups and 269,478 miles of driving, the 1999 GMC K1500 Suburban gets a combined Avg MPG of 13.40 with a 0.19 MPG margin of error.

Any Engine Type 5.7L V8 GAS (15) V8 GAS (2) Any Body Style Sport Utility (11) Any Submodel SLE (4) SLT (11) Other (2)

Below you can see a distribution of the fuel-ups with 11 outliers (1.44%) removed.

Following shows the average MPG of each of the 17 vehicles in the system.

• John

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Dec 2018 • 68 Fuel-ups

  Property of jdendy4

• 10.8 Avg MPG

• BK K1500 Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed
  Added Dec 2018 • 30 Fuel-ups

  Property of BKSubDriver

• 17.6 Avg MPG

• GMC

  1999 GMC K1500 Suburban SLE 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Mar 2018 • 14 Fuel-ups

  Property of xfilesbuff

• 15.2 Avg MPG

• Paula The Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Dec 2017 • 31 Fuel-ups

  Property of rickras20

• 15.7 Avg MPG

• Suburban

  1999 GMC K1500 Suburban SLE 5.7L V8 GAS Automatic 4 Speed
  Added Mar 2017 • 133 Fuel-ups

  Property of f-pig

• 13.5 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

• Humpty Dumpty

  1999 GMC K1500 Suburban SLE 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Sep 2013 • 201 Fuel-ups

  Property of LazySpread

• 13.9 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

• Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Mar 2016 • 7 Fuel-ups

  Property of mackguy

• 15.7 Avg MPG

• 99 Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed Sport Utility
  Added Oct 2010 • 77 Fuel-ups

  Property of landisv

• 14.4 Avg MPG

• '99GMC Suburban 4X4, 5.7L V8

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Sport Utility (4 Door)
  Added Jul 2009 • 82 Fuel-ups

  Property of ksa63

• 13.8 Avg MPG

• GMC Suburban

  1999 GMC K1500 Suburban SLT 5.7L V8 GAS Automatic 4 Speed
  Added Mar 2018 • 11 Fuel-ups

  Property of Homer014

• 15.9 Avg MPG

• Big Dog, aka "Sebastian"

  1999 GMC K1500 Suburban GAS V8
  Added Apr 2013 • 25 Fuel-ups

  Property of 77Drives

• 13.3 Avg MPG