Based on data from 20 vehicles, 1,072 fuel-ups and 237,953 miles of driving, the 2021 Subaru WRX STI gets a combined Avg MPG of 18.93 with a 0.21 MPG margin of error.

Any Engine Type 2.5L H4 GAS (20) Any Body Style Sedan (7) Any Submodel Limited (9) Base (11)

Below you can see a distribution of the fuel-ups with 9 outliers (0.83%) removed.

Following shows the average MPG of each of the 20 vehicles in the system.

• My WRX STI

  2021 Subaru WRX STI 2.5L H4 GAS Manual 6 Speed
  Added Mar 2022 • 174 Fuel-ups

  Property of Jbisset

• 18.8 Avg MPG

• WRX

  2021 Subaru WRX STI Limited 2.5L H4 GAS Manual 6 Speed
  Added Jan 2022 • 90 Fuel-ups

  Property of CycloGeek54

• 17.2 Avg MPG

• WRX STI

  2021 Subaru WRX STI 2.5L H4 GAS Manual 6 Speed Sedan
  Added Sep 2021 • 193 Fuel-ups

  Property of Matt35657

• 21.4 Avg MPG

• My WRX STI

  2021 Subaru WRX STI 2.5L H4 GAS Manual 6 Speed
  Added Sep 2021 • 153 Fuel-ups

  Property of leanderwarner

• 17.6 Avg MPG

• WRX STI

  2021 Subaru WRX STI Limited 2.5L H4 GAS Manual 6 Speed Sedan
  Added May 2021 • 128 Fuel-ups

  Property of mistahchen

• 19.2 Avg MPG

• My WRX STI

  2021 Subaru WRX STI Limited 2.5L H4 GAS Manual 6 Speed
  Added Aug 2022 • 13 Fuel-ups

  Property of dazman83

• 20.8 Avg MPG

• STI

  2021 Subaru WRX STI Limited 2.5L H4 GAS Manual 6 Speed Sedan
  Added Nov 2022 • 51 Fuel-ups

  Property of Lynseylu

• 20.2 Avg MPG

• My STi

  2021 Subaru WRX STI Limited 2.5L H4 GAS Manual 6 Speed Sedan
  Added Sep 2021 • 29 Fuel-ups

  Property of brianzchen

• 18.4 Avg MPG

• My WRX STI

  2021 Subaru WRX STI 2.5L H4 GAS Manual 6 Speed
  Added Jun 2022 • 19 Fuel-ups

  Property of JTGibbons

• 16.5 Avg MPG

• Snow White STI

  2021 Subaru WRX STI Limited 2.5L H4 GAS Manual 6 Speed
  Added May 2021 • 65 Fuel-ups

  Property of tuned200

• 22.0 Avg MPG

• Subaru WRX STi

  2021 Subaru WRX STI 2.5L H4 GAS Manual 6 Speed Sedan
  Added Apr 2021 • 34 Fuel-ups

  Property of crodil2

• 18.6 Avg MPG

• STI Limited

  2021 Subaru WRX STI Limited 2.5L H4 GAS Manual 6 Speed
  Added Jul 2021 • 28 Fuel-ups

  Property of Whaever

• 16.3 Avg MPG

• 2021 WRX STI

  2021 Subaru WRX STI Limited 2.5L H4 GAS Manual 6 Speed
  Added Aug 2021 • 16 Fuel-ups

  Property of refimage

• 18.5 Avg MPG

• My WRX STI

  2021 Subaru WRX STI 2.5L H4 GAS Manual 6 Speed
  Added Dec 2022 • 37 Fuel-ups

  Property of carguy560740

• 18.3 Avg MPG

• My WRX STI

  2021 Subaru WRX STI 2.5L H4 GAS Manual 6 Speed
  Added Jul 2021 • 13 Fuel-ups

  Property of jasonbrent

• 21.4 Avg MPG

• Louise

  2021 Subaru WRX STI 2.5L H4 GAS Manual 6 Speed
  Added Apr 2022 • 10 Fuel-ups

  Property of BitTexas

• 19.0 Avg MPG

• Revenant

  2021 Subaru WRX STI 2.5L H4 GAS Manual 6 Speed Sedan
  Added Apr 2021 • 53 Fuel-ups

  Property of sliceoflife

• 22.1 Avg MPG

• My WRX STI

  2021 Subaru WRX STI 2.5L H4 GAS Manual 6 Speed
  Added Sep 2021 • 8 Fuel-ups

  Property of jedgington

• 21.8 Avg MPG

• WRX STI

  2021 Subaru WRX STI 2.5L H4 GAS Manual 6 Speed
  Added Sep 2021 • 20 Fuel-ups

  Property of thomashewlett

• 16.4 Avg MPG

• Persephone

  2021 Subaru WRX STI Limited 2.5L H4 GAS Manual 6 Speed Sedan
  Added Jul 2021 • 52 Fuel-ups

  Property of BrilliantLuck

• 18.2 Avg MPG