Smart Forfour — MPG & Fuel Costs 2025
Smart's four-seat city car, sharing its platform with the Renault Twingo, delivering tight turning circles and low running costs.
The second-generation Smart Forfour features a unique rear-engine, rear-wheel-drive layout shared with the Renault Twingo, maximizing cabin room.
It is powered by compact three-cylinder petrol engines, which are highly economical and cheap to insure.
Real-world fuel economy is excellent, with the naturally aspirated 1.0-litre model easily returning 55 MPG in mixed driving.
TL;DR
55 MPG
Real-world petrol
35L
Tank capacity
£47.88
Full tank (petrol)
11.3p
Per mile (petrol)
Real-World Fuel Economy: The Smart Forfour achieves an estimated 55 MPG in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 35-litre tank completely costs approximately £47.88 at average UK fuel price rates.
Fuel economy at a glance
55
Real-world MPG
Petrol
65.7
Official WLTP
Petrol
Annual fuel costs by mileage
| Annual mileage | Petrol |
|---|---|
| 5,000 miles/yr | £565 |
| 7,400 miles/yr(UK average) | £837 |
| 10,000 miles/yr | £1131 |
| 15,000 miles/yr | £1696 |
| 20,000 miles/yr | £2261 |
| Full tank (35L) | £47.88 |
| Cost per mile | 11.3p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the Forfour compare?
Tips to get better MPG from your Forfour
Upshift early to utilize the engine's low-end pull.
Turn off air conditioning on short urban trips to maximize fuel economy.
Keep tyre pressures checked weekly to ensure rolling efficiency.
Is the cheaper petrol station worth it?
In a Smart Forfour achieving ~55 MPG real-world, if you fill 28 litres and the alternative station is 10p/litre cheaper:
£2.80
Gross saving on fuel
£0.34
Cost of 3-mile detour
£2.46
Net saving ✓
You could drive up to 25 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 Forfour?
The Smart Forfour achieves approximately 55 MPG in real-world petrol driving — around 12% lower than the official WLTP figure of 65.7 MPG due to real driving conditions. Diesel variants achieve around N/A MPG real-world.
How much does it cost to fill a Smart Forfour?
The Smart Forfour has a fuel tank of 35 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £47.88. Diesel costs approximately £49.73 for a full tank.
What is the annual fuel cost for a Smart Forfour?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a Smart Forfour costs approximately £837 per year in fuel. At 10,000 miles/year the cost rises to £1131. Actual costs vary with your driving style and mileage.
Is it worth driving to a cheaper petrol station in a Smart Forfour?
In a Smart Forfour doing ~55 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 28-litre fill nets approximately £2.46 after the extra fuel cost. You could drive up to 25 miles before the saving is eaten up. Use the WorthThePump calculator for your exact situation.
How much does the Smart Forfour cost per mile in fuel?
The Smart Forfour costs approximately 11.3p per mile in petrol at current UK prices. Over a typical commute of 30 miles per day, that is approximately £3.39 per day in fuel.
What is the WLTP MPG figure for the Smart Forfour?
The official WLTP fuel economy figure for the Smart Forfour is 65.7 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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