Audi A6 — MPG & Fuel Costs 2025
Audi's large luxury executive saloon. Exceptionally quiet and comfortable, with highly frugal mild-hybrid diesel options.
TL;DR
34 MPG
Real-world petrol
46 MPG
Real-world diesel
63L
Tank capacity
£86.18
Full tank (petrol)
18.3p
Per mile (petrol)
Real-World Fuel Economy: The Audi A6 achieves an estimated 34 MPG (petrol) and 46 MPG (diesel) in real-world UK driving conditions, accounting for a 12% WLTP real-world penalty.
Forecourt Fuel Cost: Refueling the 63-litre tank completely costs approximately £86.18 (petrol) or £89.52 (diesel) at average UK fuel price rates.
Fuel economy at a glance
34
Real-world MPG
Petrol
40.9
Official WLTP
Petrol
46
Real-world MPG
Diesel
54.3
Official WLTP
Diesel
Annual fuel costs by mileage
| Annual mileage | Petrol | Diesel |
|---|---|---|
| 5,000 miles/yr | £915 | £702 |
| 7,400 miles/yr(UK average) | £1354 | £1039 |
| 10,000 miles/yr | £1829 | £1404 |
| 15,000 miles/yr | £2744 | £2106 |
| 20,000 miles/yr | £3658 | £2809 |
| Full tank (63L) | £86.18 | £89.52 |
| Cost per mile | 18.3p | 14.0p |
Based on UK average fuel prices: petrol 136.8p/L · diesel 142.1p/L. Prices updated regularly.
How does the A6 compare?
Tips to get better MPG from your A6
The 40 TDI features a 12V mild-hybrid system; accelerate smoothly to utilize the start-assist.
Avoid sudden braking and accelerate progressively to manage this large car's momentum.
Opt for the standard efficiency drive mode to soften gear shifts and save fuel.
Is the cheaper petrol station worth it?
In a Audi A6 achieving ~34 MPG real-world, if you fill 50 litres and the alternative station is 10p/litre cheaper:
£5.00
Gross saving on fuel
£0.55
Cost of 3-mile detour
£4.45
Net saving ✓
You could drive up to 27 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 Audi A6?
The Audi A6 achieves approximately 34 MPG in real-world petrol driving — around 12% lower than the official WLTP figure of 40.9 MPG due to real driving conditions. Diesel variants achieve around 46 MPG real-world.
How much does it cost to fill a Audi A6?
The Audi A6 has a fuel tank of 63 litres. At the UK average of 136.8p/litre for petrol, a full tank costs approximately £86.18. Diesel costs approximately £89.52 for a full tank.
What is the annual fuel cost for a Audi A6?
At the UK average annual mileage of 7,400 miles and current petrol price of 136.8p/litre, a Audi A6 costs approximately £1354 per year in fuel. At 10,000 miles/year the cost rises to £1829. Actual costs vary with your driving style and mileage.
Is it worth driving to a cheaper petrol station in a Audi A6?
In a Audi A6 doing ~34 MPG real-world, driving 3 miles round-trip to save 10p/litre on a 50-litre fill nets approximately £4.45 after the extra fuel cost. You could drive up to 27 miles before the saving is eaten up. Use the WorthThePump calculator for your exact situation.
How much does the Audi A6 cost per mile in fuel?
The Audi A6 costs approximately 18.3p per mile in petrol at current UK prices. Over a typical commute of 30 miles per day, that is approximately £5.49 per day in fuel.
What is the WLTP MPG figure for the Audi A6?
The official WLTP fuel economy figure for the Audi A6 is 40.9 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
Find the cheapest fuel for your A6
Enter your registration and we'll calculate whether the cheaper station nearby is worth the detour — factoring in your A6's real-world MPG.
Try WorthThePump — it's free