Lexus GS 300/GS 430
20.5 MPG The 2006 Lexus GS 300/GS 430 is EPA-rated at 20.5 MPG combined (17.5 city / 25 highway). Over 15,000 miles a year that is about 732 gallons, $2341 a year in fuel, or $0.156 per mile at $3.20/gal.
Across its full 2001–2006 run it averages 18.8 MPG, improving by 2.5 MPG over 6 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 | $0.122 | $1220 | $1829 | $2439 |
| $3.00/gal | $0.146 | $1463 | $2195 | $2927 |
| $3.20/gal | $0.156 | $1561 | $2341 | $3122 |
| $3.50/gal | $0.171 | $1707 | $2561 | $3415 |
| $4.00/gal | $0.195 | $1951 | $2927 | $3902 |
| $4.50/gal | $0.220 | $2195 | $3293 | $4390 |
| $5.00/gal | $0.244 | $2439 | $3659 | $4878 |
Every model year
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2006 | 20.5 MPG | 17.5 | 25 | $3775 | 436 | 2 |
| 2005 | 18.5 MPG | 16 | 22.5 | $4175 | 481 | 2 |
| 2004 | 18.5 MPG | 16 | 22.5 | $4175 | 481 | 2 |
| 2003 | 18.5 MPG | 16 | 22.5 | $4175 | 481 | 2 |
| 2002 | 18.5 MPG | 16 | 22 | $4175 | 481 | 2 |
| 2001 | 18 MPG | 16 | 21.5 | $4300 | 494 | 2 |
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 261 midsize cars models tracked here, the Lexus GS 300/GS 430 ranks 184 on current figures, against a class average of 27.2 MPG.
Closest more-efficient alternatives in the same class: Acura TL (20.7), Dodge Dynasty (20.7), Pontiac 6000 (20.7), Acura 3.2TL (21), Buick Century (21).
Tailpipe CO₂ is rated at 436 grams per mile, which works out to roughly 6.5 tonnes a year at 15,000 miles.
Questions
What MPG does the Lexus GS 300/GS 430 get?
The 2006 Lexus GS 300/GS 430 is rated at 20.5 MPG combined by the EPA — 17.5 city and 25 highway. Across all 6 model years in the database it averages 18.8 MPG, ranging from 18 to 22 depending on year and trim.
How much does a Lexus GS 300/GS 430 cost in fuel per year?
At 20.5 MPG and 15,000 miles a year, it burns about 732 gallons — roughly $2341 a year with fuel at $3.20 a gallon, or $0.156 per mile. The EPA's own published annual figure for the 2006 model is $3775.
Has the Lexus GS 300/GS 430 become more efficient over time?
Yes. It has gone from 18 MPG in 2001 to 20.5 in 2006 — an improvement of 2.5 MPG, or 14% across 6 model years.
Is the Lexus GS 300/GS 430 efficient for its class?
It ranks 184 of 261 in the Midsize Cars class on current figures, against a class average of 27.2 MPG. That is 6.7 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.