Vauxhall Omega — MPG & Fuel Costs 2025
Vauxhall's flagship rear-wheel-drive executive saloon, offering massive passenger comfort and heavy-duty towing capacity.
The Vauxhall Omega was the last traditional large executive car from Vauxhall, offering rear-wheel drive, luxurious cabin space, and supreme ride comfort.
Engines ranged from four-cylinder petrols to smooth V6s and a robust 2.5-litre six-cylinder turbodiesel sourced directly from BMW.
Real-world fuel economy averages 32 MPG for the diesel and 24 MPG for the four-cylinder petrol models under mixed driving conditions.
TL;DR
24 MPG
Real-world petrol
32 MPG
Real-world diesel
75L
Tank capacity
£102.60
Full tank (petrol)
25.9p
Per mile (petrol)
Real-World Fuel Economy: The Vauxhall Omega achieves an estimated 24 MPG (petrol) and 32 MPG (diesel) in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 75-litre tank completely costs approximately £102.60 (petrol) or £106.58 (diesel) at average UK fuel price rates.
Fuel economy at a glance
24
Real-world MPG
Petrol
29.4
Official WLTP
Petrol
32
Real-world MPG
Diesel
38.7
Official WLTP
Diesel
Annual fuel costs by mileage
| Annual mileage | Petrol | Diesel |
|---|---|---|
| 5,000 miles/yr | £1296 | £1009 |
| 7,400 miles/yr(UK average) | £1918 | £1494 |
| 10,000 miles/yr | £2591 | £2019 |
| 15,000 miles/yr | £3887 | £3028 |
| 20,000 miles/yr | £5182 | £4037 |
| Full tank (75L) | £102.60 | £106.58 |
| Cost per mile | 25.9p | 20.2p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the Omega compare?
Tips to get better MPG from your Omega
The Omega is heavy; accelerate smoothly and avoid sudden bursts of speed to save fuel.
The 2.5 DTI diesel (sourced from BMW) is highly efficient on motorway cruises.
Ensure tyre pressures are adjusted correctly to prevent rolling resistance drag.
Is the cheaper petrol station worth it?
In a Vauxhall Omega achieving ~24 MPG real-world, if you fill 60 litres and the alternative station is 10p/litre cheaper:
£6.00
Gross saving on fuel
£0.78
Cost of 3-mile detour
£5.22
Net saving ✓
You could drive up to 23 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 Omega?
The Vauxhall Omega achieves approximately 24 MPG in real-world petrol driving — around 12% lower than the official WLTP figure of 29.4 MPG due to real driving conditions. Diesel variants achieve around 32 MPG real-world.
How much does it cost to fill a Vauxhall Omega?
The Vauxhall Omega has a fuel tank of 75 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £102.60. Diesel costs approximately £106.58 for a full tank.
What is the annual fuel cost for a Vauxhall Omega?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a Vauxhall Omega costs approximately £1918 per year in fuel. At 10,000 miles/year the cost rises to £2591. Actual costs vary with your driving style and mileage.
Is it worth driving to a cheaper petrol station in a Vauxhall Omega?
In a Vauxhall Omega doing ~24 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 60-litre fill nets approximately £5.22 after the extra fuel cost. You could drive up to 23 miles before the saving is eaten up. Use the WorthThePump calculator for your exact situation.
How much does the Vauxhall Omega cost per mile in fuel?
The Vauxhall Omega costs approximately 25.9p per mile in petrol at current UK prices. Over a typical commute of 30 miles per day, that is approximately £7.77 per day in fuel.
What is the WLTP MPG figure for the Vauxhall Omega?
The official WLTP fuel economy figure for the Vauxhall Omega is 29.4 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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