Porsche 928 — MPG & Fuel Costs 2025
Porsche's classic front-engined V8 grand tourer. Luxurious, advanced for its time, but with high fuel consumption.
The Porsche 928 was originally intended to replace the 911, offering a luxurious V8-powered grand touring experience with advanced rear-wheel steering.
It features a range of powerful water-cooled V8 engines, providing massive performance and high cruising refinement.
Real-world fuel economy is low, with the V8 averaging around 16 MPG under typical driving conditions.
TL;DR
16 MPG
Real-world petrol
86L
Tank capacity
£117.65
Full tank (petrol)
38.9p
Per mile (petrol)
Real-World Fuel Economy: The Porsche 928 achieves an estimated 16 MPG in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 86-litre tank completely costs approximately £117.65 at average UK fuel price rates.
Fuel economy at a glance
16
Real-world MPG
Petrol
20.2
Official WLTP
Petrol
Annual fuel costs by mileage
| Annual mileage | Petrol |
|---|---|
| 5,000 miles/yr | £1943 |
| 7,400 miles/yr(UK average) | £2876 |
| 10,000 miles/yr | £3887 |
| 15,000 miles/yr | £5830 |
| 20,000 miles/yr | £7774 |
| Full tank (86L) | £117.65 |
| Cost per mile | 38.9p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the 928 compare?
Tips to get better MPG from your 928
The large V8 engine is thirsty; keep acceleration progressive to manage fuel usage.
Use the overdrive top gear on automatic models during highway cruises.
Maintain the mechanical fuel injection system regularly to avoid running rich.
Is the cheaper petrol station worth it?
In a Porsche 928 achieving ~16 MPG real-world, if you fill 69 litres and the alternative station is 10p/litre cheaper:
£6.90
Gross saving on fuel
£1.17
Cost of 3-mile detour
£5.73
Net saving ✓
You could drive up to 18 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 928?
The Porsche 928 achieves approximately 16 MPG in real-world petrol driving — around 12% lower than the official WLTP figure of 20.2 MPG due to real driving conditions. Diesel variants achieve around N/A MPG real-world.
How much does it cost to fill a Porsche 928?
The Porsche 928 has a fuel tank of 86 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £117.65. Diesel costs approximately £122.21 for a full tank.
What is the annual fuel cost for a Porsche 928?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a Porsche 928 costs approximately £2876 per year in fuel. At 10,000 miles/year the cost rises to £3887. Actual costs vary with your driving style and mileage.
Is it worth driving to a cheaper petrol station in a Porsche 928?
In a Porsche 928 doing ~16 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 69-litre fill nets approximately £5.73 after the extra fuel cost. You could drive up to 18 miles before the saving is eaten up. Use the WorthThePump calculator for your exact situation.
How much does the Porsche 928 cost per mile in fuel?
The Porsche 928 costs approximately 38.9p per mile in petrol at current UK prices. Over a typical commute of 30 miles per day, that is approximately £11.67 per day in fuel.
What is the WLTP MPG figure for the Porsche 928?
The official WLTP fuel economy figure for the Porsche 928 is 20.2 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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