Based on data from 34 vehicles, 2,581 fuel-ups and 616,798 miles of driving, the 1998 GMC K1500 gets a combined Avg MPG of 12.98 with a 0.11 MPG margin of error.

Any Engine Type 5.0L V8 GAS (4) 5.7L V8 GAS (28) V8 GAS (2) Any Body Style Extended Cab Pickup (12) Cab & Chassis - Extended Cab (1) Any Submodel Sierra SL (3) Sierra SLT (6) Sierra SLE (23) Other (2)

Below you can see a distribution of the fuel-ups with 68 outliers (2.57%) removed.

Following shows the average MPG of each of the 34 vehicles in the system.

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• GMC Seirra SLE

  1998 GMC K1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Oct 2017 • 310 Fuel-ups

  Property of Caseguy

• 13.9 Avg MPG

• Green Machine

  1998 GMC K1500 Sierra SLT 5.7L V8 GAS Automatic 4 Speed
  Added Mar 2024 • 4 Fuel-ups

  Property of sychoburger02

• 10.2 Avg MPG

• Little Jimmy

  1998 GMC K1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Jan 2021 • 68 Fuel-ups

  Property of Nvridgerunners

• 13.1 Avg MPG

• My K1500

  1998 GMC K1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed
  Added Dec 2023 • 30 Fuel-ups

  Property of stevegilmer

• 13.9 Avg MPG

• My K1500

  1998 GMC K1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed
  Added Apr 2022 • 4 Fuel-ups

  Property of EddHenderson

• 18.9 Avg MPG

• 1998 GMC Sierra

  1998 GMC K1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Nov 2018 • 556 Fuel-ups

  Property of bmp4free

• 11.9 Avg MPG

• The Beast

  1998 GMC K1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Sep 2008 • 184 Fuel-ups

  Property of Jay2TheRescue

• 14.2 Avg MPG

• Sierra

  1998 GMC K1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed
  Added Feb 2021 • 56 Fuel-ups

  Property of k1500-4-life

• 12.8 Avg MPG

• GMC Pickup

  1998 GMC K1500 Sierra SLE 5.0L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Sep 2018 • 184 Fuel-ups

  Property of CornelR

• 15.5 Avg MPG

• The Z71

  1998 GMC K1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed Cab & Chassis - Extended Cab
  Added Jan 2013 • 93 Fuel-ups

  Property of Tundradude

• 10.0 Avg MPG

• My Sierra

  1998 GMC K1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed
  Added Jan 2021 • 4 Fuel-ups

  Property of pumpdodger

• 34.9 Avg MPG

• 98 GMC Truck

  1998 GMC K1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed
  Added Mar 2017 • 83 Fuel-ups

  Property of hnp357

• 12.0 Avg MPG

• Truck

  1998 GMC K1500 Sierra SL 5.7L V8 GAS Automatic 4 Speed
  Added Aug 2016 • 137 Fuel-ups

  Property of Ryan94

• 12.4 Avg MPG

• 98 chevy

  1998 GMC K1500 Sierra SLE 5.7L V8 GAS Automatic Extended Cab Pickup
  Added Aug 2018 • 9 Fuel-ups

  Property of TGund

• 13.9 Avg MPG

• Z71

  1998 GMC K1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Nov 2017 • 129 Fuel-ups

  Property of 72afr

• 14.9 Avg MPG

• Old blue

  1998 GMC K1500 Sierra SLT 5.7L V8 GAS Automatic 4 Speed
  Added Jul 2018 • 94 Fuel-ups

  Property of b_wright5

• 13.3 Avg MPG

• GMC Truck

  1998 GMC K1500 Sierra SLT 5.7L V8 GAS Automatic 4 Speed
  Added Mar 2017 • 262 Fuel-ups

  Property of ephyx

• 14.3 Avg MPG

• GMC Sierra

  1998 GMC K1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Jun 2021 • 77 Fuel-ups

  Property of Wjordan

• 16.1 Avg MPG

• GMC Sierra

  1998 GMC K1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Feb 2019 • 77 Fuel-ups

  Property of Wjordan

• 16.1 Avg MPG

• GMC

  1998 GMC K1500 Sierra SLT 5.7L V8 GAS Automatic 4 Speed
  Added Mar 2017 • 66 Fuel-ups

  Property of andrew3231

• 13.1 Avg MPG

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