Ford Fiesta ST — MPG & Fuel Costs 2025
The definitive modern hot hatch. Powered by a punchy 1.5-litre 3-cylinder engine with cylinder deactivation.
The Ford Fiesta ST is widely regarded as one of the best hot hatchbacks of all time, offering incredible handling and driver engagement. The ST-generation features a clever 1.5-litre three-cylinder EcoBoost engine.
To save fuel, this high-performance engine can shut down one of its cylinders when cruising under light load, turning the car into a twin-cylinder Eco-cruiser.
In daily driving, the Fiesta ST is surprisingly economical. Smooth commuting yields 40-44 MPG, though aggressive track or B-road driving will see this drop into the high 20s.
TL;DR
41 MPG
Real-world petrol
42L
Tank capacity
£57.46
Full tank (petrol)
15.2p
Per mile (petrol)
Real-World Fuel Economy: The Ford Fiesta ST achieves an estimated 41 MPG in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 42-litre tank completely costs approximately £57.46 at average UK fuel price rates.
Fuel economy at a glance
41
Real-world MPG
Petrol
47.9
Official WLTP
Petrol
Annual fuel costs by mileage
| Annual mileage | Petrol |
|---|---|
| 5,000 miles/yr | £758 |
| 7,400 miles/yr(UK average) | £1122 |
| 10,000 miles/yr | £1517 |
| 15,000 miles/yr | £2275 |
| 20,000 miles/yr | £3034 |
| Full tank (42L) | £57.46 |
| Cost per mile | 15.2p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the Fiesta ST compare?
Tips to get better MPG from your Fiesta ST
Take advantage of cylinder deactivation on motorways by maintaining a steady throttle.
Use the Normal driving mode rather than Sport or Track to keep the fuel mapping sensible.
Ensure you run high-quality 97+ RON fuel for optimal timing and combustion efficiency.
Is the cheaper petrol station worth it?
In a Ford Fiesta ST achieving ~41 MPG real-world, if you fill 34 litres and the alternative station is 10p/litre cheaper:
£3.40
Gross saving on fuel
£0.46
Cost of 3-mile detour
£2.94
Net saving ✓
You could drive up to 22 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 Ford Fiesta ST?
The Ford Fiesta ST achieves approximately 41 MPG in real-world petrol driving — around 12% lower than the official WLTP figure of 47.9 MPG due to real driving conditions. Diesel variants achieve around N/A MPG real-world.
How much does it cost to fill a Ford Fiesta ST?
The Ford Fiesta ST has a fuel tank of 42 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £57.46. Diesel costs approximately £59.68 for a full tank.
What is the annual fuel cost for a Ford Fiesta ST?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a Ford Fiesta ST costs approximately £1122 per year in fuel. At 10,000 miles/year the cost rises to £1517. Actual costs vary with your driving style and mileage.
Is it worth driving to a cheaper petrol station in a Ford Fiesta ST?
In a Ford Fiesta ST doing ~41 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 34-litre fill nets approximately £2.94 after the extra fuel cost. You could drive up to 22 miles before the saving is eaten up. Use the WorthThePump calculator for your exact situation.
How much does the Ford Fiesta ST cost per mile in fuel?
The Ford Fiesta ST costs approximately 15.2p per mile in petrol at current UK prices. Over a typical commute of 30 miles per day, that is approximately £4.56 per day in fuel.
What is the WLTP MPG figure for the Ford Fiesta ST?
The official WLTP fuel economy figure for the Ford Fiesta ST is 47.9 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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