Porsche 911 vs Mercedes-Benz GLS-Class
A detailed look at how two of Australia's most popular cars compare on price, running costs, safety, and everyday livability.
Specifications and pricing correct at time of publishing. Prices are RRP before on-road costs unless stated otherwise. Always confirm with the manufacturer or dealer before purchasing.
Price Breakdown
The Porsche 911 starts from $248,400 before on-road costs, while the Mercedes-Benz GLS-Class opens at $199,900. That makes the Mercedes-Benz GLS-Class the more affordable entry point by $48,500.
Once you factor in stamp duty, registration, CTP insurance, and dealer delivery, expect to add roughly 8-12% on top of the RRP depending on your state. That puts estimated driveaway prices in the ballpark of $273,240 and $219,890 respectively.
Over 5 years, the running costs are nearly identical since both have similar efficiency.
Safety Rundown
Both the Porsche 911 and Mercedes-Benz GLS-Class hold a 5-star ANCAP safety rating.
Where the two diverge is in active safety technology. The Mercedes-Benz GLS-Class packs more ADAS features with 7 out of 10 key systems fitted, compared to 0 in the Porsche 911.
Both include the essentials: a reversing camera. The Mercedes-Benz GLS-Class adds a 360-degree camera that the Porsche 911 misses.
Feature Showdown
Both come with modern infotainment systems.
The Mercedes-Benz GLS-Class counters with wireless Apple CarPlay/Android Auto, head-up display, wireless charging, panoramic roof, power tailgate, Burmester audio and ambient lighting that the Porsche 911 does not offer. Which feature set matters more depends on your daily routine and priorities.
Drivetrain
The Porsche 911 uses a Petrol producing 290kW and 450Nm of torque, sent through a 8-speed pdk to a RWD layout. It covers the 0-100km/h sprint in 4.1 seconds.
The Mercedes-Benz GLS-Class responds with a Petrol making 270kW and 500Nm, paired to a automatic driving all four wheels. It gets to 100km/h in 5.9 seconds.
The Porsche 911 has the clear power advantage at 290kW vs 270kW. In the real-world sprint, the Porsche 911 is 1.8s quicker. For most buyers, the way each car feels day-to-day matters more than outright acceleration.
Space & Comfort
The Porsche 911 measures 4,533mm long on a 2,450mm wheelbase, 674mm shorter than the Mercedes-Benz GLS-Class at 5,207mm (3,135mm wheelbase). The longer wheelbase on the Mercedes-Benz GLS-Class generally means more rear legroom.
Boot space is 132L in the Porsche 911 and 680L in the Mercedes-Benz GLS-Class, giving the Mercedes-Benz GLS-Class a 548L advantage. The Mercedes-Benz GLS-Class seats 7 vs 4.
Turning Circle
Kerb-to-kerb diameter. Smaller turns easier in tight carparks and U-turns.
12.8m diameter
Large
Based on 12.8m turning circle:
- U-turn on standard street (7m+ wide)
- Standard parking bay
- Tight carparks
- Narrow laneways
Turning circle ratings
True Cost to Own
Based on 15,000km of annual driving, fuel costs roughly $3,164/year for the Porsche 911 and $2,993/year for the Mercedes-Benz GLS-Class. That is a $171 annual difference in favour of the Mercedes-Benz GLS-Class.
Estimated annual total: $3,164 (Porsche 911) vs $2,993 (Mercedes-Benz GLS-Class). The Mercedes-Benz GLS-Class saves you roughly $171 per year in total ownership costs. Use our Fuel Cost Calculator to estimate based on your driving.
Warranty: 3 years / 999,999km (Porsche 911) vs 5 years / 999,999km (Mercedes-Benz GLS-Class). The Mercedes-Benz GLS-Class has longer coverage.
Who Should Buy Which?
Buy the Porsche 911 if: You prioritise performance, or prefer Porsche's approach to design and ownership experience.
Buy the Mercedes-Benz GLS-Class if: You want the lower entry price, need more boot space, want lower running costs, value a longer warranty, or prefer Mercedes-Benz's approach to design and ownership experience.
The Verdict
The Mercedes-Benz GLS-Class takes 4 of 6 key spec categories and comes in at a lower price. The Mercedes-Benz GLS-Class will save you roughly $171 a year in fuel. If boot space matters, the Mercedes-Benz GLS-Class has a clear edge. The Mercedes-Benz GLS-Class adds peace of mind with a longer 5-year warranty. The best pick depends on what you value most. Explore the full specs for each model below.
Common questions
Which is cheapest, Porsche 911 and Mercedes-Benz GLS-Class?
The Mercedes-Benz GLS-Class is the cheapest at $199,900 before on-road costs. That undercuts the Porsche 911 by $48,500.
Which is the most fuel-efficient?
The Mercedes-Benz GLS-Class uses the least fuel at 10.5L/100km on the combined cycle.
Which is safest?
They are evenly matched — Porsche 911 and Mercedes-Benz GLS-Class all hold a 5-star ANCAP rating. Compare the active-safety features above to separate them.
Which has the most boot space?
The Mercedes-Benz GLS-Class has the largest boot at 680L.
Which can tow the most?
The Mercedes-Benz GLS-Class has the highest braked towing capacity at 3,500kg.
Which has the best warranty?
The Mercedes-Benz GLS-Class has the longest warranty at 5 years / 1000k km.
Which is the most powerful?
The Porsche 911 makes the most power at 290kW. The Porsche 911 is quickest to 100km/h in 4.1s.
Disclaimer: All information in this comparison was believed to be correct at the time of publishing (20 April 2026). Prices are manufacturer recommended retail prices (RRP) and may vary by state, dealer, and options. Driveaway costs include estimated on-road costs for Victoria. Fuel economy figures are WLTP/ADR combined cycle. Specifications can change without notice. Always verify with the manufacturer before making a purchase decision. CarSorted does not accept payment for recommendations.
Auto-generated from CarSorted's specification data · 20 April 2026
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