What is the real-world MPG of a Audi A8?
Owners report an average of 35.3 mpg across all Audi A8 engines with data, about 94% of the official combined figure. The engine tables on this page give the figure for each engine and generation.
Audi A8 MPG: what owners actually get
Owners report 35.3 mpg from a Audi A8, about 94% of the official figure. On its NEDC-tested engines that is 91%, better than typical: the median NEDC-tested car in this 8,216-engine dataset returns 82%. The tables below give the figure for every engine and generation we hold. Add your own at the bottom and the averages get better for the next buyer.
35.3mpg
Real-world average, all engines
94%
of the official combined figure
17–55
Range reported by owners (mpg)
232
Owner submissions
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Audi A8
| Engine | Official (NEDC) | Official (WLTP) | Real MPG | % of official | Owners report |
|---|---|---|---|---|---|
| 2.8 FSI | 28.5 | – | – | – | – |
| 3.0 TDI quattro | 33.6 | – | 34.4 | 102% | – |
| 3.2 FSI | 28.8 | – | – | – | – |
| 3.2 FSI quattro | 25.6 | – | – | – | – |
| 4.2 FSI quattro | 23.7 | – | 22.2 | 94% | – |
| 4.2 TDI quattro | 30.0 | – | 31.2 | 104% | – |
| W12 | 22.8 | – | 19.7 | 86% | – |
Audi A8
| Engine | Official (NEDC) | Official (WLTP) | Real MPG | % of official | Owners report |
|---|---|---|---|---|---|
| 2.0 TFSI Hybrid | 44.1–45.6 | – | – | – | – |
| 2.0 TFSI Hybrid L | 44.1 | – | – | – | – |
| 3.0 TDI | 47.1 | – | 43.5 | 92% | 36.1–54.0 |
| 3.0 TDI quattro | 44.1–49.6 | – | 36.8 | 79% | 28.0–45.0 |
| 3.0 TDI quattro L | 43.5–48.7 | – | 37.8 | 82% | 33.0–40.4 |
| 3.0 TFSI quattro | 32.1–36.2 | – | – | – | – |
| 3.0 TFSI quattro L | 32.1 | – | – | – | – |
| 4.0 TFSI 520 quattro | 30.1 | – | 23.9 | 79% | 23.2–24.5 |
| 4.0 TFSI L | 29.7–30.7 | – | 32.7 | 108% | 27.3–38.0 |
| 4.0 TFSI quattro L | 29.7 | – | – | – | – |
| 4.2 FSI quattro | 29.7 | – | 24.9 | 84% | 21.0–28.7 |
| 4.2 FSI quattro L | 29.1 | – | – | – | – |
| 4.2 TDI L | 37.7–38.7 | – | – | – | – |
| 4.2 TDI quattro | 37.7–39.2 | – | 30.8 | 80% | 24.0–37.9 |
| 4.2 TDI quattro L | 37.7 | – | 36.5 | 97% | 28.0–39.0 |
| W12 6.3 L | 23.7–25.7 | – | – | – | – |
Audi A8
| Engine | Official (NEDC) | Official (WLTP) | Real MPG | % of official | Owners report |
|---|---|---|---|---|---|
| 4.0 TFSI 571 quattro | – | 24.6 | – | – | – |
| 50 TDI | 46.3–50.4 | 38.2–40.9 | 44.5 | 112%* | 36.7–55.0 |
| 50 TDI quattro | – | 39.2–40.4 | 45.0 | 113%* | 40.9–48.0 |
| 55 TFSI | 34.0–37.7 | 28.2–29.4 | 29.0 | 101%* | – |
| 55 TFSI quattro | – | 30.4–31.0 | – | – | – |
| 60 TFSIe | – | 122.8–156.9 | – | – | – |
| L 55 TFSI | 34.0–34.9 | 28.0–29.1 | – | – | – |
| L 60 TFSIe | – | 122.8 | – | – | – |
| L50 TDI | 47.1–50.4 | 38.2–40.4 | – | – | – |
| L55 TFSI | 34.0–37.7 | 28.5 | – | – | – |
| S8 | – | 24.6 | – | – | – |
All figures in miles per gallon (UK). “Owners report” is the spread of individual submissions for that engine. * Measured against the WLTP figure rather than NEDC.
Add your Audi A8 Real MPG
What does yours actually do? Read it off the trip computer over a full tank or work it out from litres and miles. No postcode, no sign-up. The more people add, the better the averages get, and this page stays free.
Audi A8 fuel economy questions
Why is the Audi A8 real MPG lower than the official figure?
Official figures come from a laboratory test cycle, not the road. Cold starts, short trips, hills, load, tyres and driving style all cost fuel the test does not see. A gap of 10 to 30 per cent is normal; a much bigger gap on one engine usually points at a fault, a heavy right foot, or a diesel that never gets warm.
Where did the Honest John Audi A8 Real MPG page go?
The site closed in August 2026 and its Real MPG section went with it. This page is where the Audi A8 figures now live: rebuilt from the archived dataset, with the official figures kept alongside, and reopened for new submissions.
Looking at an Audi A8 right now? Check the advert before you go and see it.
Where the Audi A8 figures come from
If you used the Honest John Real MPG section before the site closed in 2026, this is where the Audi A8 figures now live. The owner-reported averages above were rebuilt from the archived dataset (archived page, 2026-08) alongside the official NEDC and WLTP figures and new submissions from CarAdCheck readers, and the section is open so they keep improving. Real-world figures also feed the running-cost estimate in our free advert check.
CarAdCheck is not affiliated with Honest John or Volkswagen Financial Services. How we rebuilt Real MPG.
Other Audi models
Before you go and see it
Fuel economy is one line on the Audi A8 running-cost sheet. These guides cover the checks that stop you buying the wrong one.
How to haggle for a used car: negotiate the price with what its records showHPI check vs carVertical: which is better, and our pick for a UK carMOT advisories explained: how to check them, and which ones should worry you
All buyer's guides →