Smart Fortwo — MPG & Fuel Costs 2025
The ultimate microcar for city parking. Small, highly maneuverable, and returning outstanding fuel economy.
The Smart Fortwo is a revolutionary two-seat city car, offering a tiny footprint that allows it to park perpendicular to the kerb.
It features tiny turbocharged petrol and diesel engines located under the boot floor, designed specifically for low urban emissions and high economy.
Real-world fuel economy is outstanding, with the petrol models commonly returning 58 MPG under daily driving conditions.
TL;DR
58 MPG
Real-world petrol
28L
Tank capacity
£38.30
Full tank (petrol)
10.7p
Per mile (petrol)
Real-World Fuel Economy: The Smart Fortwo achieves an estimated 58 MPG in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 28-litre tank completely costs approximately £38.30 at average UK fuel price rates.
Fuel economy at a glance
58
Real-world MPG
Petrol
68.9
Official WLTP
Petrol
Annual fuel costs by mileage
| Annual mileage | Petrol |
|---|---|
| 5,000 miles/yr | £536 |
| 7,400 miles/yr(UK average) | £793 |
| 10,000 miles/yr | £1072 |
| 15,000 miles/yr | £1608 |
| 20,000 miles/yr | £2144 |
| Full tank (28L) | £38.30 |
| Cost per mile | 10.7p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the Fortwo compare?
Tips to get better MPG from your Fortwo
The Fortwo is lightweight; keeping driving style defensive yields exceptional MPG.
The automated manual transmission shifts slowly; ease off the accelerator slightly during shifts.
Avoid high speeds on motorways; the small engine works hard and consumes more fuel above 70 mph.
Is the cheaper petrol station worth it?
In a Smart Fortwo achieving ~58 MPG real-world, if you fill 22 litres and the alternative station is 10p/litre cheaper:
£2.20
Gross saving on fuel
£0.32
Cost of 3-mile detour
£1.88
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 Smart Fortwo?
The Smart Fortwo achieves approximately 58 MPG in real-world petrol driving — around 12% lower than the official WLTP figure of 68.9 MPG due to real driving conditions. Diesel variants achieve around N/A MPG real-world.
How much does it cost to fill a Smart Fortwo?
The Smart Fortwo has a fuel tank of 28 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £38.30. Diesel costs approximately £39.79 for a full tank.
What is the annual fuel cost for a Smart Fortwo?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a Smart Fortwo costs approximately £793 per year in fuel. At 10,000 miles/year the cost rises to £1072. Actual costs vary with your driving style and mileage.
Is it worth driving to a cheaper petrol station in a Smart Fortwo?
In a Smart Fortwo doing ~58 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 22-litre fill nets approximately £1.88 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 Smart Fortwo cost per mile in fuel?
The Smart Fortwo costs approximately 10.7p per mile in petrol at current UK prices. Over a typical commute of 30 miles per day, that is approximately £3.21 per day in fuel.
What is the WLTP MPG figure for the Smart Fortwo?
The official WLTP fuel economy figure for the Smart Fortwo is 68.9 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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