The Porsche Boxster does 22.6 mpg combined (19.5 city, 27.8 highway), which works out to about $1,699 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 2L 4-cyl does 24.8 mpg while 2.5L 6-cyl does 20 — a difference of $372 a year. Against other V6 cars it sits above the average of 19.9 mpg.
Every Porsche Boxster engine, compared
Gas mileage on the Porsche Boxster ranges from 24.8 down to 20 depending on which engine sits under the bonnet — a spread of $372 a year across 4 versions of the same car. Picking the right one often saves more fuel than picking a different car altogether. Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 2L 4-cyl | 21.8 / 28.5 | 2017–2020 | $1,548 | |
| 2.9L 6-cyl | 20 / 29 | 2009–2012 | $1,634 | |
| 2.7L 6-cyl | 19.3 / 28.1 | 2000–2016 | $1,722 | |
| 2.5L 6-cyl | 17 / 24 | 1997–1999 | $1,920 |
What that actually costs
The Porsche Boxster burns a gallon every 22.6 miles, so 12,000 miles takes about 531 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.142 |
| Fuel per year | $1,699 |
| Fuel over five years | $8,495 |
| Against other V6 cars | −$231 a year |
| EPA's own estimate | $3,433 a year |
City or highway — who is this car for
The Porsche Boxster gives up 8.3 mpg the moment you leave the motorway — 27.8 out there against 19.5 in town, a 43% drop worth $588 a year. A wide gap punishes stop-and-start traffic; a narrow one means the car doesn't care where you drive it.
| Measure | Value | Reading |
|---|---|---|
| City | 19.5 mpg | $1,969 a year if you only drive in town |
| Highway | 27.8 mpg | $1,381 a year if you mostly commute |
| Gap | +8.3 mpg (43%) | Wide — this car dislikes traffic |
How the Boxster changed over the years
The Boxster peaked in 2019 at 25 mpg (22 city, 29 highway) and was at its thirstiest in 2002 at 20 — 5 mpg apart, or $384 a year in fuel between buying one year and the other. The 2020 car does 24. Jumps usually mark a new generation or a new engine; dips often mean a heavier body or added all-wheel drive.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2020 | 21 / 27 | 1 | $1,600 | |
| 2019 | 22 / 29 | 1 | $1,536 | |
| 2018 | 22 / 29 | 1 | $1,536 | |
| 2017 | 22 / 29 | 1 | $1,536 | |
| 2016 | 22 / 31 | 1 | $1,536 | |
| 2015 | 22 / 31 | 1 | $1,536 | |
| 2014 | 22 / 31 | 1 | $1,536 | |
| 2013 | 22 / 31 | 1 | $1,536 | |
| 2012 | 20 / 29 | 1 | $1,670 | |
| 2011 | 20 / 29 | 1 | $1,670 | |
| 2010 | 20 / 29 | 1 | $1,600 | |
| 2009 | 20 / 29 | 1 | $1,600 | |
| 2008 | 20 / 29 | 1 | $1,670 | |
| 2007 | 20 / 29 | 1 | $1,670 | |
| 2006 | 18 / 27 | 1 | $1,829 | |
| 2005 | 18 / 27 | 1 | $1,829 | |
| 2004 | 18 / 27 | 1 | $1,829 | |
| 2003 | 18 / 27 | 1 | $1,829 | |
| 2002 | 17 / 25 | 1 | $1,920 | |
| 2001 | 17 / 25 | 1 | $1,920 | |
| 2000 | 17 / 25 | 1 | $1,920 | |
| 1999 | 17 / 24 | 1 | $1,920 | |
| 1998 | 17 / 24 | 1 | $1,920 | |
| 1997 | 17 / 24 | 1 | $1,920 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 24 EPA ratings of the Porsche Boxster — 4 engines across 1997–2020. The mileage is EPA's laboratory figure, unchanged; the yearly bill is ours, at 12,000 miles and $3.20 a gallon, against EPA's own estimate of $3,433. Full method.
Frequently asked questions
What mpg does the Porsche Boxster get?
22.6 mpg combined on average — 19.5 in the city and 27.8 on the highway, per EPA ratings across 1997–2020.
How much does a Porsche Boxster cost in fuel per year?
About $1,699 at 12,000 miles and $3.20 a gallon — roughly $8,495 over five years, or 0.142 dollars a mile.
Which Boxster engine is the most economical?
The 2L 4-cyl at 24.8 mpg, against 20 for the 2.5L 6-cyl — a difference of about $372 a year.
Is the Boxster good on fuel compared with similar cars?
Against other V6 cars it sits above the average of 19.9 mpg, computed across 4940 ratings.
Are these real-world Boxster figures?
No — they are EPA laboratory ratings, the same ones printed on the window sticker, and EPA's own annual fuel estimate for the Porsche Boxster is $3,433 against the $1,699 we compute at 12,000 miles. Expect a little worse in practice: the spread between the 25 and 20 mpg versions of this car is smaller than the spread between two drivers of the same one.
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