BMW Z4 — MPG & Fuel Costs 2025
BMW's stylish two-seat roadster, sharing a platform with the Toyota Supra. Refined and economical.
The third-generation BMW Z4 is a refined open-top sports roadster developed in partnership with Toyota. It returned to a lightweight fabric roof to reduce weight and lower the centre of gravity.
Power options include the highly efficient 2.0-litre four-cylinder TwinPower turbo petrol and the smooth, powerful 3.0-litre straight-six M40i. The 2.0-litre is particularly fuel-efficient.
Real-world fuel economy averages a very respectable 33-36 MPG for the sDrive20i, making it a highly practical sports car for daily commuting.
TL;DR
33 MPG
Real-world petrol
52L
Tank capacity
£71.14
Full tank (petrol)
18.8p
Per mile (petrol)
Real-World Fuel Economy: The BMW Z4 achieves an estimated 33 MPG in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 52-litre tank completely costs approximately £71.14 at average UK fuel price rates.
Fuel economy at a glance
33
Real-world MPG
Petrol
39.2
Official WLTP
Petrol
Annual fuel costs by mileage
| Annual mileage | Petrol |
|---|---|
| 5,000 miles/yr | £942 |
| 7,400 miles/yr(UK average) | £1395 |
| 10,000 miles/yr | £1885 |
| 15,000 miles/yr | £2827 |
| 20,000 miles/yr | £3769 |
| Full tank (52L) | £71.14 |
| Cost per mile | 18.8p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the Z4 compare?
Tips to get better MPG from your Z4
Use the Eco Pro driving mode on motorway runs to activate the gearbox decoupling coast feature.
Keep the folding fabric roof closed at high speeds to maintain optimal aerodynamics.
Avoid harsh throttle inputs; the sDrive20i has strong low-down torque.
Is the cheaper petrol station worth it?
In a BMW Z4 achieving ~33 MPG real-world, if you fill 42 litres and the alternative station is 10p/litre cheaper:
£4.20
Gross saving on fuel
£0.57
Cost of 3-mile detour
£3.63
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 BMW Z4?
The BMW Z4 achieves approximately 33 MPG in real-world petrol driving — around 12% lower than the official WLTP figure of 39.2 MPG due to real driving conditions. Diesel variants achieve around N/A MPG real-world.
How much does it cost to fill a BMW Z4?
The BMW Z4 has a fuel tank of 52 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £71.14. Diesel costs approximately £73.89 for a full tank.
What is the annual fuel cost for a BMW Z4?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a BMW Z4 costs approximately £1395 per year in fuel. At 10,000 miles/year the cost rises to £1885. Actual costs vary with your driving style and mileage.
Is it worth driving to a cheaper petrol station in a BMW Z4?
In a BMW Z4 doing ~33 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 42-litre fill nets approximately £3.63 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 BMW Z4 cost per mile in fuel?
The BMW Z4 costs approximately 18.8p per mile in petrol at current UK prices. Over a typical commute of 30 miles per day, that is approximately £5.64 per day in fuel.
What is the WLTP MPG figure for the BMW Z4?
The official WLTP fuel economy figure for the BMW Z4 is 39.2 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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