Based on data from 41 vehicles, 2,275 fuel-ups and 600,897 miles of driving, the 1999 GMC Sierra 1500 gets a combined Avg MPG of 14.11 with a 0.12 MPG margin of error.

Any Engine Type 4.3L V6 GAS (2) 4.8L V8 GAS (2) 5.3L V8 GAS (23) GAS (1) V8 GAS (10) Any Body Style Standard Cab Pickup (2) Extended Cab Pickup (9) Crew Cab Pickup (1) Any Submodel SL (4) SLT (8) SLE (17) Other (12)

Below you can see a distribution of the fuel-ups with 91 outliers (3.85%) removed.

Following shows the average MPG of each of the 41 vehicles in the system.

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• Blue work truck

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Jul 2019 • 35 Fuel-ups

  Property of cdizzle

• 11.2 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Feb 2018 • 87 Fuel-ups

  Property of clintmccoy

• 15.7 Avg MPG

• Sierra

  1999 GMC Sierra 1500 SL 4.3L V6 GAS Automatic 4 Speed Standard Cab Pickup
  Added Oct 2017 • 79 Fuel-ups

  Property of bhagedorn

• 12.9 Avg MPG

• Plow Truck

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed Standard Cab Pickup
  Added Jul 2020 • 10 Fuel-ups

  Property of drconnelly85

• 12.8 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Feb 2020 • 58 Fuel-ups

  Property of ChadButtke

• 13.3 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Oct 2020 • 12 Fuel-ups

  Property of xxhybridxx

• 16.5 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Jul 2019 • 12 Fuel-ups

  Property of hoffajd

• 16.5 Avg MPG

• Truck

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Extended Cab Pickup
  Added Jan 2020 • 35 Fuel-ups

  Property of EY44

• 15.9 Avg MPG

• Sierra

  1999 GMC Sierra 1500 SL 4.3L V6 GAS Automatic 4 Standard Cab Pickup (2 Door)
  Added Aug 2015 • 19 Fuel-ups

  Property of katjlr

• 16.4 Avg MPG

• Walter Beard

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

  Property of roguemale

• 13.4 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added May 2019 • 7 Fuel-ups

  Property of 405g

• 14.8 Avg MPG

• 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

• 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

• Truck

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Apr 2017 • 193 Fuel-ups

  Property of Darcie

• 18.4 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

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