Vauxhall Astra GTC — MPG & Fuel Costs 2025
The sporty three-door coupe version of the Astra, combining striking design with economical engine options.
The Vauxhall Astra GTC is a stylish three-door hatchback designed to compete in the sporty coupe-like sector of the UK market. With its wider track and lowered sports suspension, it offers more engaging driving dynamics than the standard Astra.
Engine options are shared with the standard Astra but tuned for a sportier feel. The 1.4-litre Turbo petrol is a popular compromise between performance and cost, while the 1.6 CDTi EcoFlex engine targets maximum fuel economy.
Real-world fuel economy is decent, with the EcoFlex diesel comfortably exceeding 55 MPG on longer commutes. Petrol versions will yield around 38-42 MPG depending on how enthusiastically they are driven.
TL;DR
41 MPG
Real-world petrol
53 MPG
Real-world diesel
56L
Tank capacity
£76.61
Full tank (petrol)
15.2p
Per mile (petrol)
Real-World Fuel Economy: The Vauxhall Astra GTC achieves an estimated 41 MPG (petrol) and 53 MPG (diesel) in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 56-litre tank completely costs approximately £76.61 (petrol) or £79.58 (diesel) at average UK fuel price rates.
Fuel economy at a glance
41
Real-world MPG
Petrol
47.9
Official WLTP
Petrol
53
Real-world MPG
Diesel
62.8
Official WLTP
Diesel
Annual fuel costs by mileage
| Annual mileage | Petrol | Diesel |
|---|---|---|
| 5,000 miles/yr | £758 | £609 |
| 7,400 miles/yr(UK average) | £1122 | £902 |
| 10,000 miles/yr | £1517 | £1219 |
| 15,000 miles/yr | £2275 | £1828 |
| 20,000 miles/yr | £3034 | £2438 |
| Full tank (56L) | £76.61 | £79.58 |
| Cost per mile | 15.2p | 12.2p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the Astra GTC compare?
Tips to get better MPG from your Astra GTC
Avoid harsh acceleration in lower gears; let the turbo build boost progressively.
Check tyre pressures weekly to maintain low rolling resistance on wide low-profile tyres.
Use high-quality synthetic oil to minimize internal friction and protect the turbocharger.
Is the cheaper petrol station worth it?
In a Vauxhall Astra GTC achieving ~41 MPG real-world, if you fill 45 litres and the alternative station is 10p/litre cheaper:
£4.50
Gross saving on fuel
£0.46
Cost of 3-mile detour
£4.04
Net saving ✓
You could drive up to 30 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 Vauxhall Astra GTC?
The Vauxhall Astra GTC achieves approximately 41 MPG in real-world petrol driving — around 12% lower than the official WLTP figure of 47.9 MPG due to real driving conditions. Diesel variants achieve around 53 MPG real-world.
How much does it cost to fill a Vauxhall Astra GTC?
The Vauxhall Astra GTC has a fuel tank of 56 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £76.61. Diesel costs approximately £79.58 for a full tank.
What is the annual fuel cost for a Vauxhall Astra GTC?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a Vauxhall Astra GTC costs approximately £1122 per year in fuel. At 10,000 miles/year the cost rises to £1517. Actual costs vary with your driving style and mileage.
Is it worth driving to a cheaper petrol station in a Vauxhall Astra GTC?
In a Vauxhall Astra GTC doing ~41 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 45-litre fill nets approximately £4.04 after the extra fuel cost. You could drive up to 30 miles before the saving is eaten up. Use the WorthThePump calculator for your exact situation.
How much does the Vauxhall Astra GTC cost per mile in fuel?
The Vauxhall Astra GTC costs approximately 15.2p per mile in petrol at current UK prices. Over a typical commute of 30 miles per day, that is approximately £4.56 per day in fuel.
What is the WLTP MPG figure for the Vauxhall Astra GTC?
The official WLTP fuel economy figure for the Vauxhall Astra GTC is 47.9 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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