Based on data from 50 vehicles, 2,461 fuel-ups and 641,769 miles of driving, the 1999 GMC Sierra 1500 gets a combined Avg MPG of 13.77 with a 0.13 MPG margin of error.

Any Engine Type 4.3L V6 GAS (5) 4.8L V8 GAS (4) 5.3L V8 GAS (27) GAS (1) V8 GAS (10) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (10) Crew Cab Pickup (1) Any Submodel SL (7) SLT (11) SLE (20) Other (12)

Below you can see a distribution of the fuel-ups with 34 outliers (1.36%) removed.

Following shows the average MPG of each of the 50 vehicles in the system.

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• My Sierra 1500

  1999 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Jul 2019 • 14 Fuel-ups

  Property of reyes_gabriel350

• 14.3 Avg MPG

• GMC Pickup

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Jun 2018 • 137 Fuel-ups

  Property of Fr8Ddy

• 15.7 Avg MPG

• Old fuck truck

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Jul 2018 • 39 Fuel-ups

  Property of Robertk9

• 14.5 Avg MPG

• Truck

  1999 GMC Sierra 1500 SLT 4.8L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Feb 2019 • 187 Fuel-ups

  Property of kstevens

• 14.7 Avg MPG

• GMC Sierra

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added May 2023 • 19 Fuel-ups

  Property of Browncurtisw

• 51.0 Avg MPG

• SilverGMC

  1999 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Feb 2015 • 23 Fuel-ups

  Property of 80Gator

• 13.5 Avg MPG

• 1999 Service Truck

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Aug 2016 • 138 Fuel-ups

  Property of EONI

• 13.7 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Jul 2017 • 18 Fuel-ups

  Property of squidhunter

• 15.7 Avg MPG

• sierra 4 door

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Crew Cab Pickup
  Added Jun 2011 • 136 Fuel-ups

  Property of Pauly

• 13.2 Avg MPG

• GMC

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added May 2017 • 90 Fuel-ups

  Property of seanhouston

• 13.8 Avg MPG

• GMC Sierra

  1999 GMC Sierra 1500 GAS V8
  Added Mar 2012 • 85 Fuel-ups

  Property of frescojulio103

• 11.7 Avg MPG

• Woody III

  1999 GMC Sierra 1500 SL
  Added Jul 2015 • 22 Fuel-ups

  Property of Data

• 15.4 Avg MPG

• GMC Truck

  1999 GMC Sierra 1500 SLT Extended Cab Pickup
  Added Jan 2016 • 32 Fuel-ups

  Property of pierceme

• 16.4 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Aug 2016 • 9 Fuel-ups

  Property of danielm11

• 9.4 Avg MPG

• Sierra Ext 4.8L

  1999 GMC Sierra 1500 SL 4.8L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Jun 2011 • 33 Fuel-ups

  Property of old450

• 16.3 Avg MPG

• 1999 GMC (Blaine)

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Sep 2016 • 163 Fuel-ups

  Property of gkarels

• 11.3 Avg MPG

• 1999 Sierra

  1999 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Oct 2015 • 4 Fuel-ups

  Property of m1000rr6

• 13.2 Avg MPG

• Gmc Sierra

  1999 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Mar 2018 • 6 Fuel-ups

  Property of aahall

• 20.9 Avg MPG

• GMC Sierra

  1999 GMC Sierra 1500 GAS V8
  Added Nov 2013 • 19 Fuel-ups

  Property of manicjester3

• 13.1 Avg MPG

• dads truck

  1999 GMC Sierra 1500 GAS
  Added Dec 2013 • 18 Fuel-ups

  Property of redrod

• 17.4 Avg MPG

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