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The Audi Q9 and Mercedes-Benz GLS are both large luxury SUVs, but the available German-market figures do not establish an overall winner for space, comfort or ownership cost. Audi has announced the Q9 as a new flagship with seven seats standard and an optional six-seat layout; Mercedes-Benz has updated the GLS with comfort and cabin-technology changes across a multi-engine range. The most useful comparison depends on the exact market, engine, seat layout and equipment you are considering.
What is actually comparable?
The figures currently available are primarily for Germany. Audi’s Q9 launch price and fuel-consumption range relate to a German-market diesel model, while the GLS consumption figures are German WLTP ranges. They are not U.S. prices or EPA ratings, and they do not provide a same-market total-cost comparison.
Audi said Q9 deliveries would begin in Germany in the fourth quarter of 2026 and that availability in additional markets was under review in its July 29, 2026 announcement. Mercedes-Benz described the updated GLS in a March 31, 2026 release. Check local launch timing, model year, trim and equipment before treating either vehicle as available in your market.
Space and practicality
Audi Q9: published dimensions and seating
Audi lists the Q9 at 5.31 m long, 2.21 m wide including mirrors, 1.81 m high, with a 3.14 m wheelbase. Seven seats are standard; an optional six-seat layout replaces the second-row bench with two electrically adjustable individual seats. Audi also lists towing capacity of up to 3,500 kg. These are manufacturer-published specifications in the Q9 announcement.
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Where the comparison stops
The available figures do not include directly comparable GLS dimensions, standardized passenger-room measurements, third-row legroom or luggage volumes for either SUV. The Q9’s length and wheelbase establish its exterior scale, but they cannot show which vehicle carries more luggage or offers more usable room with all seats occupied.
Audi’s earlier May 12, 2026 interior preview described a cargo rail system fixed to the trunk sides, electric doors, Qi2.2 wireless charging and roof rails with an included roof rack. For an actual purchase comparison, verify which features are fitted to the local vehicle and compare luggage space with the third row both in use and folded.
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Comfort and equipment
Audi Q9
Audi highlights the optional six-seat arrangement with powered individual second-row seats, powered doors, adaptive air suspension, rear-axle steering and a panoramic roof. This is manufacturer equipment and positioning, not an independent ride or comfort assessment; availability can vary by market and configuration. The precise local trim sheet matters, particularly for second-row adjustment, climate and entertainment equipment.
Mercedes-Benz GLS
Mercedes-Benz says the updated GLS includes an MBUX Superscreen with a passenger display, a Rear Comfort Package Plus, AIRMATIC with cloud-based damper control and added acoustic insulation. Those are manufacturer descriptions in its March 2026 release; confirm standard versus optional equipment on the specific vehicle and in the relevant market. The company’s “S-Class of SUVs” wording is positioning, not an independent judgment of comfort.
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For a meaningful showroom comparison, check second-row access and adjustment, third-row entry, ride-system specification, wheels and tires, cabin noise, climate zones and which comfort features are included in the quoted trim. No independent head-to-head test is established by the available evidence.
Running costs: German-market figures
The following manufacturer figures use litres per 100 kilometres. The Q9 value is for the German launch diesel; Mercedes-Benz labels its GLS figures as combined WLTP consumption for Germany. Engine type and test basis differ, so these ranges are not a direct prediction of what one owner will spend.
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| Vehicle and version | German-market combined consumption | Price information available |
|---|---|---|
| Audi Q9 TDI, 3.0-litre V6 diesel; 220 kW (299 PS), 630 Nm | 7.4–8.0 l/100 km (29.4–31.8 US mpg); CO₂ emissions 194–209 g/km | €108,400 starting price for the German launch model |
| Mercedes-Benz GLS 450 petrol | 10.9–9.9 l/100 km (combined WLTP) | A comparable GLS starting price is not stated in the cited material |
| Mercedes-Benz GLS 350d and 450d diesels | 8.5–7.8 l/100 km (combined WLTP) | A comparable GLS starting price is not stated in the cited material |
| Mercedes-Benz GLS 580 | 13.7–13.1 l/100 km (combined WLTP) | A comparable GLS starting price is not stated in the cited material |
The Q9 specifications, price and consumption are from Audi’s launch announcement and German-market pricing and consumption release. The GLS ranges are from Mercedes-Benz’s March 2026 release. They are manufacturer-published figures, not independent real-world measurements. Mercedes-Benz notes that consumption depends on vehicle use and other factors.
The GLS ranges show why engine choice matters: its listed diesel and petrol versions have different consumption figures, as does the GLS 580. Comparing the Q9 diesel with a GLS petrol as if they were equivalent would obscure that difference. Nor does the Q9’s lower-looking figure alone prove it will cost less to own: fuel bills depend on local prices, annual mileage and real driving, while total ownership also depends on taxes, insurance, servicing, financing, warranty and depreciation.
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How to make a fair local comparison
- Confirm availability and model year. Ask a local dealer which Q9 and GLS versions can actually be ordered and when they will be delivered.
- Match the configuration. Compare the same seat count and similar comfort equipment, and note which items are standard or optional.
- Compare usable space in person. Bring the passengers and luggage you need to carry; check third-row access and cargo room with the seats in the positions you will use.
- Match powertrains and test methods. Compare like fuel types where possible and keep each official consumption figure attached to its market and homologation cycle. Do not treat WLTP as an EPA rating or a real-world promise.
- Build a local ownership estimate. Use the quoted price for the exact trim, local energy prices and your annual distance; add insurance, tax, scheduled service and financing only when you have comparable quotes.
Mercedes-Benz’s May 28, 2026 order information does not establish a GLS starting price in the cited material, so a German Q9 price should not be compared against a different model’s price or treated as a U.S. figure.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
