Based on data from 50 vehicles, 2,460 fuel-ups and 641,539 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 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Jul 2019 • 28 Fuel-ups

  Property of hoffajd

• 16.2 Avg MPG

• ‘99 Sierra

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Nov 2021 • 67 Fuel-ups

  Property of keith_284

• 11.5 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SL 4.3L V6 GAS Automatic 4 Speed
  Added Oct 2022 • 39 Fuel-ups

  Property of gnatsumder

• 12.1 Avg MPG

• 99 Sierra

  1999 GMC Sierra 1500 SL 4.3L V6 GAS Automatic 4 Speed Standard Cab Pickup
  Added Oct 2017 • 159 Fuel-ups

  Property of bhagedorn

• 11.7 Avg MPG

• Sierra

  1999 GMC Sierra 1500 SL 4.3L V6 GAS Automatic 4 Standard Cab Pickup (2 Door)
  Added Aug 2015 • 25 Fuel-ups

  Property of katjlr

• 18.5 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SLE 5.3L V8 GAS Automatic 4 Speed
  Added Feb 2018 • 154 Fuel-ups

  Property of clintmccoy

• 15.6 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Jul 2022 • 11 Fuel-ups

  Property of connor7mvl

• 14.6 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SLE 4.8L V8 GAS Manual 5 Speed
  Added Aug 2023 • 5 Fuel-ups

  Property of cohenkoch1

• 15.5 Avg MPG

• Walter Beard

  1999 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Apr 2018 • 40 Fuel-ups

  Property of roguemale

• 13.9 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SL 4.3L V6 GAS Manual 5 Speed
  Added Jan 2022 • 85 Fuel-ups

  Property of Bridewell1

• 11.4 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SL 5.3L V8 GAS Automatic 4 Speed
  Added Feb 2023 • 7 Fuel-ups

  Property of MavJ

• 14.3 Avg MPG

• Grey

  1999 GMC Sierra 1500 SLE 4.8L V8 GAS Manual 5 Speed Standard Cab Pickup
  Added Dec 2022 • 6 Fuel-ups

  Property of Tommychu

• 11.3 Avg MPG

• 99 Shortbed

  1999 GMC Sierra 1500 SLE 4.3L V6 GAS Automatic 4 Speed Standard Cab Pickup
  Added Sep 2022 • 3 Fuel-ups

  Property of IFIXEM2

• 16.0 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Aug 2022 • 3 Fuel-ups

  Property of djlamm

• 13.3 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 Apr 2022 • 10 Fuel-ups

  Property of aretz94

• 15.0 Avg MPG

• My Sierra 1500

  1999 GMC Sierra 1500 SLT 5.3L V8 GAS Automatic 4 Speed
  Added Nov 2021 • 10 Fuel-ups

  Property of joebro28

• 14.8 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

• 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

• 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

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