STI Fuel Economy and Fuel Cost by Model
STI has 1 models with EPA fuel economy ratings between 2019 and 2019. In model year 2019 the combined ratings of its models run 17 MPG. The most efficient is the 2019 STI S209 at 17 MPG, about $4,670 a year to fuel at premium gasoline $5.36/gal (U.S. average, Sep 2026).
Models
1
2019–2019
Most efficient, MY2019
17MPG
STI S209
Cheapest to fuel, MY2019
$4,670/yr
STI S209
Electrified models
0
hybrid, plug-in or electric
Most efficient STI models, MY2019
| 1 | 2019 STI S209 Small cars | 17 | $4,670 |
All STI models
| Model | Model years | Powertrains | Latest MY | Combined | $/yr |
|---|---|---|---|---|---|
| STI S209 | 2019–2019 | Gas | 2019 | 17 | $4,670 |
Ratings and costs are for each model's latest model year; costs use the current EIA price set and 15,000 miles a year.
STI by size class
- Small cars: 1
Frequently asked questions
Which STI gets the best gas mileage?
In model year 2019, the most efficient STI is the 2019 STI S209 at 17 MPG combined.
What is the cheapest STI to fuel?
In model year 2019, the 2019 STI S209 is the cheapest STI to fuel: about $4,670 a year at 15,000 miles, using premium gasoline $5.36/gal (U.S. average, Sep 2026).
How many STI models does EPA rate?
EPA lists 1 STI models for model years 2019 to 2019. 1 of them have ratings for MY2019.
Does STI make hybrid or electric cars?
No. In EPA's database every STI model from 2019 to 2019 runs on gasoline or diesel only.