MG MG3 — MPG & Fuel Costs 2025
MG's highly affordable compact hatchback, offering high value, trendy styling, and very respectable petrol fuel economy.
TL;DR
45 MPG
Real-world petrol
45L
Tank capacity
£61.56
Full tank (petrol)
13.8p
Per mile (petrol)
Real-World Fuel Economy: The MG MG3 achieves an estimated 45 MPG in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 45-litre tank completely costs approximately £61.56 at average UK fuel price rates.
Fuel economy at a glance
45
Real-world MPG
Petrol
53.3
Official WLTP
Petrol
Annual fuel costs by mileage
| Annual mileage | Petrol |
|---|---|
| 5,000 miles/yr | £691 |
| 7,400 miles/yr(UK average) | £1023 |
| 10,000 miles/yr | £1382 |
| 15,000 miles/yr | £2073 |
| 20,000 miles/yr | £2764 |
| Full tank (45L) | £61.56 |
| Cost per mile | 13.8p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the MG3 compare?
Tips to get better MPG from your MG3
Keep driving style smooth; the MG3's lightweight body rewards defensive driving.
Shift up early; the naturally aspirated engine does not require high revs.
Avoid using air conditioning continuously on short local trips to preserve MPG.
Is the cheaper petrol station worth it?
In a MG MG3 achieving ~45 MPG real-world, if you fill 36 litres and the alternative station is 10p/litre cheaper:
£3.60
Gross saving on fuel
£0.41
Cost of 3-mile detour
£3.19
Net saving ✓
You could drive up to 26 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 MG MG3?
The MG MG3 achieves approximately 45 MPG in real-world petrol driving — around 12% lower than the official WLTP figure of 53.3 MPG due to real driving conditions. Diesel variants achieve around N/A MPG real-world.
How much does it cost to fill a MG MG3?
The MG MG3 has a fuel tank of 45 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £61.56. Diesel costs approximately £63.95 for a full tank.
What is the annual fuel cost for a MG MG3?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a MG MG3 costs approximately £1023 per year in fuel. At 10,000 miles/year the cost rises to £1382. Actual costs vary with your driving style and mileage.
Is it worth driving to a cheaper petrol station in a MG MG3?
In a MG MG3 doing ~45 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 36-litre fill nets approximately £3.19 after the extra fuel cost. You could drive up to 26 miles before the saving is eaten up. Use the WorthThePump calculator for your exact situation.
How much does the MG MG3 cost per mile in fuel?
The MG MG3 costs approximately 13.8p per mile in petrol at current UK prices. Over a typical commute of 30 miles per day, that is approximately £4.14 per day in fuel.
What is the WLTP MPG figure for the MG MG3?
The official WLTP fuel economy figure for the MG MG3 is 53.3 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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