Against 529 other 4-cyl cars rated 2018–2020, the Cayman trails their 27.1 mpg average by 3.1 mpg, about $183 a year. Averaged over the years each was sold, the most economical engine since 2006, the 2L 4-cyl (2017–2020), does 24.8 mpg and the thirstiest, the 3.4L 6-cyl (2006), 21: $281 a year apart.
Every Porsche Cayman engine, compared
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 | |
| 2.7L 6-cyl | 21.2 / 30.2 | 2007–2016 | $1,587 | |
| 2.9L 6-cyl | 20 / 29 | 2009–2012 | $1,634 | |
| 3.4L 6-cyl | 18 / 25 | 2006–2006 | $1,829 |
What that actually costs
Against its rivals in the same model years, the Chevrolet Corvette gets 19 mpg and the Jaguar F-TYPE 22.2 mpg, next to 24 mpg for the 2020 Cayman. The Cayman is the cheapest of them to run: $421 a year less than the Chevrolet Corvette.
| Measure | Value |
|---|---|
| Cost per mile (2020) | $0.133 |
| Fuel per year | $1,600 |
| Fuel over five years | $8,000 |
| Against other 4-cyl cars, 2018–2020 | +$183 a year |
| EPA's own estimate | $3,232 a year |
City or highway — who is this car for
The 2020 Porsche Cayman gives up 6 mpg in town: 27 on the highway against 21 in the city, $407 a year if every mile were city driving.
| Measure | Value | Reading |
|---|---|---|
| City (2020) | 21 mpg | $1,829 a year if you only drive in town |
| Highway | 27 mpg | $1,422 a year if you mostly commute |
| Gap | +6 mpg (29%) | Typical for its type |
How the Cayman changed over the years
The Cayman peaked in 2019 at 25 mpg (22 city, 29 highway) and was at its thirstiest in 2006 at 21 — 4 mpg apart, or $293 a year in fuel between buying one year and the other. The 2020 car does 24.
| 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 | |
| 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 / 25 | 1 | $1,829 |
MPG is a number. Dollars per year is the answer.
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- Insurance and fuel folded into 5-year cost to own
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How we count
This page rests on 14 EPA ratings of the Porsche Cayman — 4 engines across 2006–2020. 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 $3,232. Full method.
Frequently asked questions
What mpg does the 2020 Porsche Cayman get?
24 mpg combined, 21 city and 27 highway, per EPA. Across every year since 2006 the Cayman has averaged 23.9 mpg.
Is the 2020 Cayman more efficient than the 2019?
No: 24 against 25 mpg combined, about $64 a year more to run.
Which Cayman year has the best gas mileage?
The 2019, at 25 mpg combined (22 city, 29 highway).
Does the Cayman get better gas mileage than the Chevrolet Corvette?
Yes: 24 mpg for the 2020 Cayman against 19 for the 2021 Chevrolet Corvette, about $421 a year less to run.
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