Porsche averages 20.2 mpg combined across 14 petrol and diesel models (1984–2026). The best on record does 25 mpg, the thirstiest 14 — a yearly fuel gap of about $1,207. Its 2 electric models sit apart at 88.5 MPGe — 38.1 kWh per 100 miles, about $777 a year to charge, which is $1,124 less than the average Porsche costs to fuel.
What that actually costs
What a Porsche costs to feed, at 12,000 miles a year and $3.20 a gallon.
| Measure | Value |
|---|---|
| Average combined | 20.2 mpg |
| Fuel per year | $1,901 |
| Most frugal on record | 25 mpg — $1,536 a year |
| Thirstiest on record | 14 mpg — $2,743 a year |
| Its electric models | 88.5 MPGe — $777 a year to charge |
Porsche models by gas mileage
From the most frugal down. The yearly figure is what the fuel actually costs at 12,000 miles.
| Model | Average mpg | Best / Worst engine | Fuel per year |
|---|---|---|---|
| Porsche Cayman | 25 / 21 | $1,607 | |
| Porsche Boxster | 25 / 20 | $1,699 | |
| Porsche 718 Boxster | 24 / 21 | $1,707 | |
| Porsche 718 Cayman | 24 / 19 | $1,730 | |
| Porsche 918 | 22 / 22 | $1,745 | |
| Porsche Panamera | 25 / 17 | $1,811 | |
| Porsche 924 | 21 / 21 | $1,829 | |
| Porsche Macan | 22 / 19 | $1,910 | |
| Porsche 911 | 25 / 16 | $1,939 | |
| Porsche 944 | 21 / 18 | $1,959 | |
| Porsche 718 Spyder | 20 / 16 | $2,076 | |
| Porsche Cayenne | 24 / 14 | $2,076 | |
| Porsche 968 | 18 / 18 | $2,133 | |
| Porsche 928 | 17 / 15 | $2,494 |
The electric Porsches, measured differently
Porsche has 2 models that never visit a filling station, averaging 88.5 MPGe. That figure looks four times better than the 20.2 mpg the petrol Porsches manage, but the two are not the same unit — so we keep them apart and price the electric ones in kilowatt-hours.
| Model | MPGe | kWh / 100 mi | Charging per year |
|---|---|---|---|
| Porsche Macan | 33.5 | $683 | |
| Porsche Taycan | 40.5 | $826 |
MPG is a number. Dollars per year is the answer.
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How we count
Porsche rests on 256 EPA ratings covering 14 models from 1984 to 2026, plus 2 electric ones counted separately in MPGe. The laboratory numbers are EPA's and go in unchanged; the money is ours, at 12,000 miles a year and $3.20 a gallon. Full method.
Frequently asked questions
What is the average Porsche gas mileage?
20.2 mpg combined across 14 models and 256 EPA ratings, from 1984 to 2026 — 42 model years in one figure, which is why it sits below what a new Porsche does today.
Which Porsche model is the most economical?
The Porsche Cayman at 23.9 mpg, about $1,607 a year in fuel, against the 928 at 15.4 mpg and $2,494 — a gap of $887 a year between the two ends of the same badge.
How much does a Porsche cost to run?
About $1,901 a year in fuel, at 12,000 miles and $3.20 a gallon. Over five years that is $9,505, before a single service.
Does Porsche make anything electric?
Yes — 2 models, rated 88.5 MPGe rather than in mpg, which works out to 38.1 kWh per 100 miles and roughly $777 a year at the socket. That is $1,124 less than the average petrol Porsche, though the two ratings are not in the same unit.
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