Based on data from 28 vehicles, 1,794 fuel-ups and 409,944 miles of driving, the 1998 GMC C1500 gets a combined Avg MPG of 13.31 with a 0.14 MPG margin of error.

Any Engine Type 4.3L V6 GAS (5) 5.0L V8 GAS (5) 5.7L V8 GAS (14) GAS (1) V8 GAS (2) Any Body Style Standard Cab Pickup (4) Extended Cab Pickup (8) Any Submodel Sierra SLT (7) Sierra SL (8) Sierra SLE (10) Other (3)

Below you can see a distribution of the fuel-ups with 73 outliers (3.91%) removed.

Following shows the average MPG of each of the 28 vehicles in the system.

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• C1500

  1998 GMC C1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed
  Added Mar 2021 • 263 Fuel-ups

  Property of mattc05

• 13.3 Avg MPG

• GMC 1500 Sierra

  1998 GMC C1500 Sierra SLT 5.7L V8 GAS Automatic 4 Speed
  Added Aug 2016 • 460 Fuel-ups

  Property of Kawika858

• 12.3 Avg MPG

• GMC Sierra 1500 2WD

  1998 GMC C1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed Standard Cab Pickup
  Added Oct 2025 • 5 Fuel-ups

  Property of DrivewayStation

• 13.8 Avg MPG

• Penny ‘98 GMC

  1998 GMC C1500 Sierra SL 5.0L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added May 2025 • 20 Fuel-ups

  Property of Blacksparkydog

• 14.3 Avg MPG

• 1998 GMC Sierra 1500

  1998 GMC C1500 Sierra SLT 5.7L V8 GAS Automatic 4 Speed
  Added Aug 2016 • 54 Fuel-ups

  Property of tleader

• 19.4 Avg MPG

• 98 GMC

  1998 GMC C1500 Sierra SLT 4.3L V6 GAS Automatic 4 Speed
  Added Jul 2020 • 58 Fuel-ups

  Property of brunz

• 16.2 Avg MPG

• Nyx

  1998 GMC C1500 Sierra SLE 5.7L V8 GAS Automatic 4 Speed
  Added Apr 2022 • 7 Fuel-ups

  Property of azninc13

• 16.2 Avg MPG

• My Sierra

  1998 GMC C1500 Sierra SLE 5.0L V8 GAS Automatic 4 Speed
  Added Apr 2023 • 128 Fuel-ups

  Property of GregHorak

• 10.4 Avg MPG

• Sheila

  1998 GMC C1500 Sierra SL 4.3L V6 GAS Manual 5 Speed
  Added Mar 2022 • 19 Fuel-ups

  Property of realoatis13

• 18.3 Avg MPG

• Truck

  1998 GMC C1500 Sierra SL 4.3L V6 GAS Automatic 4 Speed Standard Cab Pickup
  Added Jun 2022 • 7 Fuel-ups

  Property of EKAssault

• 13.2 Avg MPG

• My C1500

  1998 GMC C1500 Sierra SLE 4.3L V6 GAS Automatic 4 Speed
  Added Nov 2022 • 11 Fuel-ups

  Property of blackandwhiteX6

• 13.6 Avg MPG

• Champagne Sierra

  1998 GMC C1500 Sierra SLE 5.0L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Sep 2018 • 50 Fuel-ups

  Property of Dugg

• 15.9 Avg MPG

• 1998 GMC Sierra

  1998 GMC C1500 Sierra SLT 5.7L V8 GAS Automatic 4 Speed
  Added Sep 2016 • 154 Fuel-ups

  Property of imzippy

• 11.4 Avg MPG

• Truck

  1998 GMC C1500 Sierra SL 5.7L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Nov 2018 • 50 Fuel-ups

  Property of Phazetic99

• 14.9 Avg MPG

• My C1500

  1998 GMC C1500 Sierra SL 5.7L V8 GAS Automatic 4 Speed
  Added Oct 2018 • 3 Fuel-ups

  Property of brett77

• 13.6 Avg MPG

• Blue

  1998 GMC C1500 Sierra SLT 5.7L V8 GAS Automatic 4 Speed
  Added Feb 2018 • 42 Fuel-ups

  Property of rodge1sj

• 14.9 Avg MPG

• Pickup

  1998 GMC C1500 Sierra SL 4.3L V6 GAS Automatic 3 Speed Standard Cab Pickup
  Added May 2013 • 21 Fuel-ups

  Property of CFlath

• 17.1 Avg MPG

• Sierra 1500

  1998 GMC C1500 Sierra SLT 5.7L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Sep 2016 • 207 Fuel-ups

  Property of jdegraaf

• 13.2 Avg MPG

• GMC

  1998 GMC C1500 Sierra SL 5.0L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Jan 2017 • 75 Fuel-ups

  Property of dmahall

• 15.4 Avg MPG

• Truck

  1998 GMC C1500 Sierra SLT 5.7L V8 GAS Automatic 4 Speed Extended Cab Pickup
  Added Feb 2014 • 153 Fuel-ups

  Property of vortec5700

• 12.9 Avg MPG

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