Toyota iQ — MPG & Fuel Costs 2025
Toyota's ultra-compact, premium city car. Brilliant three-seater layout with a tiny turning circle and high fuel economy.
The Toyota iQ was a masterclass in packaging, squeezing seating for three adults and a child into a body shorter than a Smart Fortwo, using flat underfloor fuel tanks and a compact differential.
Power options included Toyota's reliable 1.0-litre three-cylinder and a 1.33-litre four-cylinder petrol. Both offer low running costs and are exempt from clean air zones.
Real-world fuel economy is highly impressive, with the 1.0-litre petrol model regularly returning over 52 MPG in urban driving, making it a perfect low-cost city runabout.
TL;DR
52 MPG
Real-world petrol
32L
Tank capacity
£43.78
Full tank (petrol)
12.0p
Per mile (petrol)
Real-World Fuel Economy: The Toyota iQ achieves an estimated 52 MPG in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 32-litre tank completely costs approximately £43.78 at average UK fuel price rates.
Fuel economy at a glance
52
Real-world MPG
Petrol
58.9
Official WLTP
Petrol
Annual fuel costs by mileage
| Annual mileage | Petrol |
|---|---|
| 5,000 miles/yr | £598 |
| 7,400 miles/yr(UK average) | £885 |
| 10,000 miles/yr | £1196 |
| 15,000 miles/yr | £1794 |
| 20,000 miles/yr | £2392 |
| Full tank (32L) | £43.78 |
| Cost per mile | 12.0p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the iQ compare?
Tips to get better MPG from your iQ
Drive smoothly in town; the iQ weighs under 900kg and rewards light footwork.
Shift up early; the VVT-i engine is designed to pull efficiently from low revs.
Check tyre pressures regularly on these tiny wheels to maintain low rolling resistance.
Is the cheaper petrol station worth it?
In a Toyota iQ achieving ~52 MPG real-world, if you fill 26 litres and the alternative station is 10p/litre cheaper:
£2.60
Gross saving on fuel
£0.36
Cost of 3-mile detour
£2.24
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 Toyota iQ?
The Toyota iQ achieves approximately 52 MPG in real-world petrol driving — around 12% lower than the official WLTP figure of 58.9 MPG due to real driving conditions. Diesel variants achieve around N/A MPG real-world.
How much does it cost to fill a Toyota iQ?
The Toyota iQ has a fuel tank of 32 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £43.78. Diesel costs approximately £45.47 for a full tank.
What is the annual fuel cost for a Toyota iQ?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a Toyota iQ costs approximately £885 per year in fuel. At 10,000 miles/year the cost rises to £1196. Actual costs vary with your driving style and mileage.
Is it worth driving to a cheaper petrol station in a Toyota iQ?
In a Toyota iQ doing ~52 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 26-litre fill nets approximately £2.24 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 Toyota iQ cost per mile in fuel?
The Toyota iQ costs approximately 12.0p per mile in petrol at current UK prices. Over a typical commute of 30 miles per day, that is approximately £3.60 per day in fuel.
What is the WLTP MPG figure for the Toyota iQ?
The official WLTP fuel economy figure for the Toyota iQ is 58.9 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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