Hyundai i40 — MPG & Fuel Costs 2025
Hyundai's spacious family saloon and Tourer estate, offering refined CRDi diesel cruise economy and high comfort levels.
TL;DR
38 MPG
Real-world petrol
52 MPG
Real-world diesel
70L
Tank capacity
£95.76
Full tank (petrol)
16.4p
Per mile (petrol)
Real-World Fuel Economy: The Hyundai i40 achieves an estimated 38 MPG (petrol) and 52 MPG (diesel) in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 70-litre tank completely costs approximately £95.76 (petrol) or £99.47 (diesel) at average UK fuel price rates.
Fuel economy at a glance
38
Real-world MPG
Petrol
44.8
Official WLTP
Petrol
52
Real-world MPG
Diesel
61.4
Official WLTP
Diesel
Annual fuel costs by mileage
| Annual mileage | Petrol | Diesel |
|---|---|---|
| 5,000 miles/yr | £818 | £621 |
| 7,400 miles/yr(UK average) | £1211 | £919 |
| 10,000 miles/yr | £1637 | £1242 |
| 15,000 miles/yr | £2455 | £1863 |
| 20,000 miles/yr | £3273 | £2485 |
| Full tank (70L) | £95.76 | £99.47 |
| Cost per mile | 16.4p | 12.4p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the i40 compare?
Tips to get better MPG from your i40
The i40 has a large 70-litre tank, making it perfect for long journeys; keeping speeds steady maximizes range.
Engage cruise control on highway stretches to keep engine RPM steady.
Check tyre pressures regularly to prevent rolling resistance.
Is the cheaper petrol station worth it?
In a Hyundai i40 achieving ~38 MPG real-world, if you fill 56 litres and the alternative station is 10p/litre cheaper:
£5.60
Gross saving on fuel
£0.49
Cost of 3-mile detour
£5.11
Net saving ✓
You could drive up to 34 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 Hyundai i40?
The Hyundai i40 achieves approximately 38 MPG in real-world petrol driving — around 12% lower than the official WLTP figure of 44.8 MPG due to real driving conditions. Diesel variants achieve around 52 MPG real-world.
How much does it cost to fill a Hyundai i40?
The Hyundai i40 has a fuel tank of 70 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £95.76. Diesel costs approximately £99.47 for a full tank.
What is the annual fuel cost for a Hyundai i40?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a Hyundai i40 costs approximately £1211 per year in fuel. At 10,000 miles/year the cost rises to £1637. Actual costs vary with your driving style and mileage.
Is it worth driving to a cheaper petrol station in a Hyundai i40?
In a Hyundai i40 doing ~38 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 56-litre fill nets approximately £5.11 after the extra fuel cost. You could drive up to 34 miles before the saving is eaten up. Use the WorthThePump calculator for your exact situation.
How much does the Hyundai i40 cost per mile in fuel?
The Hyundai i40 costs approximately 16.4p per mile in petrol at current UK prices. Over a typical commute of 30 miles per day, that is approximately £4.92 per day in fuel.
What is the WLTP MPG figure for the Hyundai i40?
The official WLTP fuel economy figure for the Hyundai i40 is 44.8 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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