Mercedes GLA — MPG & Fuel Costs 2025
Mercedes' compact crossover, sharing engineering with the A-Class, offering a raised driving position with premium cabin tech.
TL;DR
38 MPG
Real-world petrol
48 MPG
Real-world diesel
43L
Tank capacity
£58.82
Full tank (petrol)
16.4p
Per mile (petrol)
Real-World Fuel Economy: The Mercedes GLA achieves an estimated 38 MPG (petrol) and 48 MPG (diesel) in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 43-litre tank completely costs approximately £58.82 (petrol) or £61.10 (diesel) at average UK fuel price rates.
Fuel economy at a glance
38
Real-world MPG
Petrol
44.8
Official WLTP
Petrol
48
Real-world MPG
Diesel
56.5
Official WLTP
Diesel
Annual fuel costs by mileage
| Annual mileage | Petrol | Diesel |
|---|---|---|
| 5,000 miles/yr | £818 | £673 |
| 7,400 miles/yr(UK average) | £1211 | £996 |
| 10,000 miles/yr | £1637 | £1346 |
| 15,000 miles/yr | £2455 | £2019 |
| 20,000 miles/yr | £3273 | £2692 |
| Full tank (43L) | £58.82 | £61.10 |
| Cost per mile | 16.4p | 13.5p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the GLA compare?
Tips to get better MPG from your GLA
Select front-wheel drive options to save weight and maximize fuel efficiency.
Use Eco mode to optimize the dual-clutch transmission shifts.
Check tyre pressures regularly; the tall crossover profile is sensitive to rolling resistance.
Is the cheaper petrol station worth it?
In a Mercedes GLA achieving ~38 MPG real-world, if you fill 34 litres and the alternative station is 10p/litre cheaper:
£3.40
Gross saving on fuel
£0.49
Cost of 3-mile detour
£2.91
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 Mercedes GLA?
The Mercedes GLA 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 48 MPG real-world.
How much does it cost to fill a Mercedes GLA?
The Mercedes GLA has a fuel tank of 43 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £58.82. Diesel costs approximately £61.10 for a full tank.
What is the annual fuel cost for a Mercedes GLA?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a Mercedes GLA 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 Mercedes GLA?
In a Mercedes GLA doing ~38 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 34-litre fill nets approximately £2.91 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 Mercedes GLA cost per mile in fuel?
The Mercedes GLA 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 Mercedes GLA?
The official WLTP fuel economy figure for the Mercedes GLA 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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