Vauxhall Insignia — MPG & Fuel Costs 2025
A comfortable large family car and fleet favourite. Highly spacious with frugal diesel engines that excel on motorway journeys.
The Vauxhall Insignia (specifically the Grand Sport) is a spacious hatchback/saloon built for covering massive distances in comfort. It has long been a favourite of sales reps and fleet buyers due to its low running costs and relaxed cruising characteristics.
Engine options include efficient turbocharged petrols and a range of CDTi/Turbo D diesel engines. The 1.6-litre and 2.0-litre diesels are the picks of the range, offering outstanding fuel range from the generous 62-litre tank.
A real-world return of 51 MPG on the diesel makes the Insignia an incredibly cheap way to cover long distances. It represents outstanding value on the used market for drivers seeking executive-level comfort without the premium price tag.
TL;DR
38 MPG
Real-world petrol
51 MPG
Real-world diesel
62L
Tank capacity
£84.82
Full tank (petrol)
16.4p
Per mile (petrol)
Real-World Fuel Economy: The Vauxhall Insignia achieves an estimated 38 MPG (petrol) and 51 MPG (diesel) in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 62-litre tank completely costs approximately £84.82 (petrol) or £88.10 (diesel) at average UK fuel price rates.
Fuel economy at a glance
38
Real-world MPG
Petrol
44.8
Official WLTP
Petrol
51
Real-world MPG
Diesel
60.1
Official WLTP
Diesel
Annual fuel costs by mileage
| Annual mileage | Petrol | Diesel |
|---|---|---|
| 5,000 miles/yr | £818 | £633 |
| 7,400 miles/yr(UK average) | £1211 | £937 |
| 10,000 miles/yr | £1637 | £1267 |
| 15,000 miles/yr | £2455 | £1900 |
| 20,000 miles/yr | £3273 | £2533 |
| Full tank (62L) | £84.82 | £88.10 |
| Cost per mile | 16.4p | 12.7p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the Insignia compare?
Tips to get better MPG from your Insignia
Make use of the excellent cruise control system on motorways to eliminate wasteful micro-accelerations.
The Insignia has a low, aerodynamic silhouette; maintaining a clean body helps it slip through the air at high speed.
Check tyre pressures before long trips; under-inflation on a heavy car like the Insignia drags down MPG rapidly.
Is the cheaper petrol station worth it?
In a Vauxhall Insignia achieving ~38 MPG real-world, if you fill 50 litres and the alternative station is 10p/litre cheaper:
£5.00
Gross saving on fuel
£0.49
Cost of 3-mile detour
£4.51
Net saving ✓
You could drive up to 31 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 Insignia?
The Vauxhall Insignia 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 51 MPG real-world.
How much does it cost to fill a Vauxhall Insignia?
The Vauxhall Insignia has a fuel tank of 62 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £84.82. Diesel costs approximately £88.10 for a full tank.
What is the annual fuel cost for a Vauxhall Insignia?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a Vauxhall Insignia 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 Vauxhall Insignia?
In a Vauxhall Insignia doing ~38 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 50-litre fill nets approximately £4.51 after the extra fuel cost. You could drive up to 31 miles before the saving is eaten up. Use the WorthThePump calculator for your exact situation.
How much does the Vauxhall Insignia cost per mile in fuel?
The Vauxhall Insignia 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 Vauxhall Insignia?
The official WLTP fuel economy figure for the Vauxhall Insignia 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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