Porsche Cayman — MPG & Fuel Costs 2025
Porsche's mid-engined sports coupe, widely regarded as one of the best-handling driver's cars in the world.
The Porsche Cayman is a mid-engined sports car that offers supreme balance, precise steering, and an acoustic flat-six engine note.
It is powered by highly refined naturally aspirated flat-six petrol engines, delivering a highly responsive drive.
Real-world fuel economy averages 26 MPG under daily mixed driving, which is highly respectable for a pure sports car.
TL;DR
26 MPG
Real-world petrol
64L
Tank capacity
£87.55
Full tank (petrol)
23.9p
Per mile (petrol)
Real-World Fuel Economy: The Porsche Cayman achieves an estimated 26 MPG in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 64-litre tank completely costs approximately £87.55 at average UK fuel price rates.
Fuel economy at a glance
26
Real-world MPG
Petrol
31.4
Official WLTP
Petrol
Annual fuel costs by mileage
| Annual mileage | Petrol |
|---|---|
| 5,000 miles/yr | £1196 |
| 7,400 miles/yr(UK average) | £1770 |
| 10,000 miles/yr | £2392 |
| 15,000 miles/yr | £3588 |
| 20,000 miles/yr | £4784 |
| Full tank (64L) | £87.55 |
| Cost per mile | 23.9p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the Cayman compare?
Tips to get better MPG from your Cayman
Upshift early when driving around town to keep engine RPMs in the efficient band.
Maintain recommended tyre pressures to ensure optimal rolling resistance.
Avoid aggressive throttle inputs during cold starts.
Is the cheaper petrol station worth it?
In a Porsche Cayman achieving ~26 MPG real-world, if you fill 51 litres and the alternative station is 10p/litre cheaper:
£5.10
Gross saving on fuel
£0.72
Cost of 3-mile detour
£4.38
Net saving ✓
You could drive up to 21 miles round-trip before the saving disappears entirely.
Calculate for your exact situationPopular variants
Frequently asked questions
What is the real-world MPG of the Porsche Cayman?
The Porsche Cayman achieves approximately 26 MPG in real-world petrol driving — around 12% lower than the official WLTP figure of 31.4 MPG due to real driving conditions. Diesel variants achieve around N/A MPG real-world.
How much does it cost to fill a Porsche Cayman?
The Porsche Cayman has a fuel tank of 64 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £87.55. Diesel costs approximately £90.94 for a full tank.
What is the annual fuel cost for a Porsche Cayman?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a Porsche Cayman costs approximately £1770 per year in fuel. At 10,000 miles/year the cost rises to £2392. Actual costs vary with your driving style and mileage.
Is it worth driving to a cheaper petrol station in a Porsche Cayman?
In a Porsche Cayman doing ~26 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 51-litre fill nets approximately £4.38 after the extra fuel cost. You could drive up to 21 miles before the saving is eaten up. Use the WorthThePump calculator for your exact situation.
How much does the Porsche Cayman cost per mile in fuel?
The Porsche Cayman costs approximately 23.9p per mile in petrol at current UK prices. Over a typical commute of 30 miles per day, that is approximately £7.17 per day in fuel.
What is the WLTP MPG figure for the Porsche Cayman?
The official WLTP fuel economy figure for the Porsche Cayman is 31.4 MPG. However, real-world MPG is typically 10–15% lower than WLTP due to cold starts, air conditioning, motorway speeds, and varying loads. WorthThePump uses a 12% real-world penalty to give a more accurate estimate.
Related guides
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