Lexus IS 300
25 MPG The 2025 Lexus IS 300 is EPA-rated at 25 MPG combined (21 city / 31 highway). Over 15,000 miles a year that is about 600 gallons, $1920 a year in fuel, or $0.128 per mile at $3.20/gal.
Across its full 2001–2025 run it averages 22.3 MPG, improving by 7 MPG over 13 model years.
Running cost at different fuel prices and mileages
The figure everyone actually wants, and the one the EPA does not publish — because it depends on a fuel price no agency will commit to.
| Fuel price | Per mile | 10,000 mi/yr | 15,000 mi/yr | 20,000 mi/yr |
|---|---|---|---|---|
| $2.50/gal | $0.100 | $1000 | $1500 | $2000 |
| $3.00/gal | $0.120 | $1200 | $1800 | $2400 |
| $3.20/gal | $0.128 | $1280 | $1920 | $2560 |
| $3.50/gal | $0.140 | $1400 | $2100 | $2800 |
| $4.00/gal | $0.160 | $1600 | $2400 | $3200 |
| $4.50/gal | $0.180 | $1800 | $2700 | $3600 |
| $5.00/gal | $0.200 | $2000 | $3000 | $4000 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2025 | 25 MPG | 21 | 31 | $3100 | 356 | 1 |
| 2024 | 25 MPG | 21 | 31 | $3100 | 355 | 1 |
| 2023 | 25 MPG | 21 | 31 | $3100 | 355 | 1 |
| 2022 | 25 MPG | 21 | 31 | $3100 | 356 | 1 |
| 2021 | 25 MPG | 21 | 31 | $3100 | 357 | 1 |
| 2020 | 24 MPG | 21 | 30 | $3200 | 363 | 1 |
| 2019 | 24 MPG | 21 | 30 | $3200 | 360 | 1 |
| 2018 | 26 MPG | 22 | 32 | $2950 | 345 | 1 |
| 2005 | 18 MPG | 16 | 23 | $4300 | 494 | 2 |
| 2004 | 18 MPG | 16 | 22.5 | $4300 | 494 | 2 |
| 2003 | 18 MPG | 16 | 22.5 | $4300 | 494 | 2 |
| 2002 | 18.5 MPG | 16 | 23 | $4175 | 481 | 2 |
| 2001 | 18 MPG | 16 | 21 | $4300 | 494 | 1 |
Where a model year offered several engines or drivetrains, the figure is the average across all EPA-tested trims that year — the trim count is shown so you can see how much averaging is involved.
How it compares in its class
Among the 227 compact cars models tracked here, the Lexus IS 300 ranks 92 on current figures, against a class average of 26.6 MPG.
Closest more-efficient alternatives in the same class: Mazda Protege (25.3), Buick Skyhawk (25.5), Cadillac CT4 (25.5), Chevrolet Cavalier (25.5), Dodge Neon (25.5).
Tailpipe CO₂ is rated at 356 grams per mile, which works out to roughly 5.3 tonnes a year at 15,000 miles.
Questions
What MPG does the Lexus IS 300 get?
The 2025 Lexus IS 300 is rated at 25 MPG combined by the EPA — 21 city and 31 highway. Across all 13 model years in the database it averages 22.3 MPG, ranging from 18 to 26 depending on year and trim.
How much does a Lexus IS 300 cost in fuel per year?
At 25 MPG and 15,000 miles a year, it burns about 600 gallons — roughly $1920 a year with fuel at $3.20 a gallon, or $0.128 per mile. The EPA's own published annual figure for the 2025 model is $3100.
Has the Lexus IS 300 become more efficient over time?
Yes. It has gone from 18 MPG in 2001 to 25 in 2025 — an improvement of 7 MPG, or 39% across 13 model years.
Is the Lexus IS 300 efficient for its class?
It ranks 92 of 227 in the Compact Cars class on current figures, against a class average of 26.6 MPG. That is 1.6 worse than typical for the class.
EPA test figures from fueleconomy.gov. Cost per mile and annual fuel spend are computed at a reference price of $3.20 per gallon — use your own price. Estimates based on official test figures and average fuel prices. Real-world consumption varies with driving style, load, terrain and maintenance.