Vauxhall Signum — MPG & Fuel Costs 2025
Vauxhall's unusual executive hatchback, offering massive rear legroom and flexible seating layouts.
The Vauxhall Signum was a niche executive car based on the Vectra estate platform, featuring a unique rear seating arrangement designed for passenger comfort. It was aimed at fleet managers and business buyers.
The engine line-up was extensive, including the punchy 1.9 CDTi diesel engine and a smooth but thirsty 3.0-litre V6 diesel. Petrol options included the 2.2-litre Direct engine.
Real-world fuel economy is heavily influenced by the car's weight. The 1.9 CDTi (150 bhp) is the most sensible option, returning a respectable 40-43 MPG in mixed driving.
TL;DR
31 MPG
Real-world petrol
41 MPG
Real-world diesel
60L
Tank capacity
£82.08
Full tank (petrol)
20.1p
Per mile (petrol)
Real-World Fuel Economy: The Vauxhall Signum achieves an estimated 31 MPG (petrol) and 41 MPG (diesel) in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 60-litre tank completely costs approximately £82.08 (petrol) or £85.26 (diesel) at average UK fuel price rates.
Fuel economy at a glance
31
Real-world MPG
Petrol
36.2
Official WLTP
Petrol
41
Real-world MPG
Diesel
47.9
Official WLTP
Diesel
Annual fuel costs by mileage
| Annual mileage | Petrol | Diesel |
|---|---|---|
| 5,000 miles/yr | £1003 | £788 |
| 7,400 miles/yr(UK average) | £1485 | £1166 |
| 10,000 miles/yr | £2006 | £1576 |
| 15,000 miles/yr | £3009 | £2363 |
| 20,000 miles/yr | £4012 | £3151 |
| Full tank (60L) | £82.08 | £85.26 |
| Cost per mile | 20.1p | 15.8p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the Signum compare?
Tips to get better MPG from your Signum
Make use of the massive 60-litre tank by planning fuel stops at cheap supermarket pumps.
Ensure the rear seats are configured flat when carrying large cargo to prevent weight shifting.
Cruising at 60 mph instead of 70 mph on motorways saves up to 10% fuel in this heavy model.
Is the cheaper petrol station worth it?
In a Vauxhall Signum achieving ~31 MPG real-world, if you fill 48 litres and the alternative station is 10p/litre cheaper:
£4.80
Gross saving on fuel
£0.60
Cost of 3-mile detour
£4.20
Net saving ✓
You could drive up to 24 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 Signum?
The Vauxhall Signum achieves approximately 31 MPG in real-world petrol driving — around 12% lower than the official WLTP figure of 36.2 MPG due to real driving conditions. Diesel variants achieve around 41 MPG real-world.
How much does it cost to fill a Vauxhall Signum?
The Vauxhall Signum has a fuel tank of 60 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £82.08. Diesel costs approximately £85.26 for a full tank.
What is the annual fuel cost for a Vauxhall Signum?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a Vauxhall Signum costs approximately £1485 per year in fuel. At 10,000 miles/year the cost rises to £2006. Actual costs vary with your driving style and mileage.
Is it worth driving to a cheaper petrol station in a Vauxhall Signum?
In a Vauxhall Signum doing ~31 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 48-litre fill nets approximately £4.20 after the extra fuel cost. You could drive up to 24 miles before the saving is eaten up. Use the WorthThePump calculator for your exact situation.
How much does the Vauxhall Signum cost per mile in fuel?
The Vauxhall Signum costs approximately 20.1p per mile in petrol at current UK prices. Over a typical commute of 30 miles per day, that is approximately £6.03 per day in fuel.
What is the WLTP MPG figure for the Vauxhall Signum?
The official WLTP fuel economy figure for the Vauxhall Signum is 36.2 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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