Q8 vs XM
It’s Audi against BMW in the midsize luxury suv class, and the Q8 and the XM are the models carrying each flag. This is a genuine trade-off. The Q8 is stronger when it comes to fuel economy & range, while the XM pulls ahead on engine & performance.
At a glance
- Engine & Performance XM wins
- Fuel Economy & Range Q8 wins
- Space & Practicality Tie
- Off-road & Towing Tie
- Engine & Performance2.6
- Fuel Economy & Range5.9
- Engine & Performance9.4
- Fuel Economy & Range0.0
Spec scores (0 to 10) are calculated from manufacturer specs against other models in the same class. See how the formula works. They are not reviews or user ratings.
Key Differences
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The XM has 309 hp more power
Big gap, real consequences. The XM’s 644 hp versus the Q8’s 335 hp changes how the two compare in daily use. Power is only part of the story; weight, gearing and torque delivery shape how quick a car feels.
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The Q8 has better fuel economy
The XM is clearly behind on fuel economy (combined) (14 mpg against 19 mpg), and that’s one of its biggest weak spots in this matchup. Better combined fuel economy lowers your running costs every week, and the savings add up over years of ownership.
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The XM has 221 lb-ft more torque
On this line of the spec sheet, the XM is in a different league: 590 lb-ft, next to 369 lb-ft for the Q8. Electrified powertrains deliver torque instantly, so compare torque figures alongside the powertrain type.
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The Q8 has better city fuel economy
For fuel economy (city), the Q8 leads by a wide margin: 17 mpg versus 12 mpg. Hybrids often shine in the city, and the Q8 has the better rating here.
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The Q8 has better highway fuel economy
This is a headline difference. With 23 mpg to the XM’s 17 mpg, the Q8 has a lead that’s easy to see on paper and in practice. Speed, wind and load affect highway use a lot, but the official rating is a fair comparison point.
Design & Size
Engine & Performance
XM leads
Here the XM opens up one of its biggest leads in the comparison. The XM steps ahead thanks to 309 hp more power. More power helps with merging, overtaking and climbing hills, especially with passengers and luggage on board. Net result: the XM leads this part of the comparison.
Total system output
Q8: 335 hp XM: 644 hp The XM’s extra output gives it more in reserve when you need to get up to speed.
Torque
Q8: 369 lb-ft XM: 590 lb-ft More torque means stronger pulling from low speeds, which you feel when accelerating from a stop or climbing grades.
Fuel Economy & Range
Q8 leads
The fuel economy & range numbers point firmly in one direction: toward the Q8. The Q8 makes its case with better fuel economy. Official figures rarely match real-world driving exactly, but the ranking between two cars tends to hold. If fuel economy & range is your priority, the Q8 is the car to pick.
Fuel economy (combined)
Q8: 19 mpg XM: 14 mpg The Q8 uses less fuel on the standard combined cycle, which matters most if you drive a lot.
Fuel economy (city)
Q8: 17 mpg XM: 12 mpg In town, driving style has a big effect, but the Q8 starts from a better baseline.
Space & Practicality
Too close to call
Both the Q8 and the XM cover space & practicality equally well on paper. Bottom line for space & practicality: it’s a wash.
Off-road & Towing
Too close to call
There’s little to choose between them when it comes to off-road & towing. This section won’t settle the choice, so weigh the other areas more heavily.
Safety & Tech
Here the spec sheet speaks in model names and types. Compare the Q8 and the XM row by row in the table below.
Full Specifications
Engine & Performance
| Spec | Q8 | XM |
|---|---|---|
| Powertrain | Gas (48V mild hybrid) | Plug-in hybrid |
| Engine | 3.0L turbo V6 | 4.4L twin-turbo V8 + electric motor |
| Total system output | 335 hp | 644 hp (winner) Most powerful in class |
| Torque | 369 lb-ft | 590 lb-ft (winner) |
| Transmission | 8-speed automatic | 8-speed automatic |
| Drivetrain | AWD (quattro) | AWD (xDrive) |
Fuel Economy & Range
| Spec | Q8 | XM |
|---|---|---|
| Fuel economy (combined)EPA estimate where available | 19 mpg (winner) | 14 mpg Thirstiest in class |
| Fuel economy (city) | 17 mpg (winner) | 12 mpg Thirstiest in the city |
| Fuel economy (highway) | 23 mpg (winner) | 17 mpg Thirstiest on the highway |
Space & Practicality
| Spec | Q8 | XM |
|---|---|---|
| Seats | 5 seats | 5 seats |
Off-road & Towing
| Spec | Q8 | XM |
|---|---|---|
| Max towing | 7,700 lb | N/A (not specified) |
| AWD / 4WD available | Yes | Yes |
Safety & Tech
| Spec | Q8 | XM |
|---|---|---|
| Basic warranty | 4 yr / 50,000 mi | 4 yr / 50,000 mi |
“N/A” means the manufacturer does not specify the value or we could not confirm it. Figures marked “manufacturer rating” are the maker’s own claims, not our measurements.
Which One Should You Buy?
Choose the Q8 if…
- you drive a lot and want lower running costs (19 mpg vs 14 mpg combined)
- you want better city fuel economy (17 mpg vs 12 mpg)
- you cover long highway distances (23 mpg vs 17 mpg on the highway)
Choose the XM if…
- you merge, overtake or climb hills with a full load (644 hp vs 335 hp)
- you often drive loaded up or with a trailer (590 lb-ft vs 369 lb-ft of torque)
- you trust BMW and want to keep things familiar
Also Compared
Frequently Asked Questions
Which is better for most people, the Q8 or the XM?
It depends on your priorities: the Q8 is stronger on fuel economy & range, while the XM leads on engine & performance.
Executive Summary
Here’s my take on Audi’s Q8 versus BMW’s XM. The Q8 earns my vote first and foremost with better fuel economy. I also like that the Q8 brings better highway fuel economy. Fairness check: the XM does come with 309 hp more power.
The Q8 makes sense for anyone who values fuel economy & range; the XM for anyone who values engine & performance.
My pick: there’s no single winner, so choose the Q8 for fuel economy & range or the XM for engine & performance.
Personal opinion based on the data above. Your priorities may differ.