A6 vs G90
Few matchups in the midsize luxury car class come up as often as the A6 against the G90. Where the A6 shines on fuel economy & range, the G90 counters on engine & performance.
At a glance
- Engine & Performance G90 wins
- Fuel Economy & Range A6 wins
- Space & Practicality Tie
- Off-road & Towing Tie
- Engine & Performance0.2
- Fuel Economy & Range4.0
- Engine & Performance4.1
- Fuel Economy & Range0.5
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 G90 has 114 hp more power
Here the G90 pulls well ahead of the A6, with 375 hp compared to 261 hp. The G90’s extra output gives it more in reserve when you need to get up to speed.
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The A6 has better fuel economy
The A6 doesn’t just edge this one; 26 mpg against 21 mpg is a lead you’ll feel. Official figures rarely match real-world driving exactly, but the ranking between two cars tends to hold.
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The G90 has 118 lb-ft more torque
Big gap, real consequences. The G90’s 391 lb-ft versus the A6’s 273 lb-ft changes how the two compare in daily use. The G90’s extra torque makes it more relaxed when fully loaded or towing.
-
The A6 has better city fuel economy
The G90 is clearly behind on fuel economy (city) (18 mpg against 24 mpg), and that’s one of its biggest weak spots in this matchup. Hybrids often shine in the city, and the A6 has the better rating here.
-
The A6 has better highway fuel economy
On this line of the spec sheet, the A6 is in a different league: 31 mpg, next to 26 mpg for the G90. Speed, wind and load affect highway use a lot, but the official rating is a fair comparison point.
Design & Size
Dimensions
| Spec | A6 | G90 |
|---|---|---|
| Length | N/A (not specified) | 207.7 in |
| Width (no mirrors) | N/A (not specified) | 76.4 in |
| Height | N/A (not specified) | 58.7 in |
| Wheelbase | N/A (not specified) | 125.2 in |
Engine & Performance
G90 leads
On engine & performance, the gap between these two is wide, and it favors the G90. The G90 stands out with 114 hp more power. More power helps with merging, overtaking and climbing hills, especially with passengers and luggage on board. If this section decides it for you, choose the G90.
Total system output
A6: 261 hp G90: 375 hp Power is only part of the story; weight, gearing and torque delivery shape how quick a car feels.
Torque
A6: 273 lb-ft G90: 391 lb-ft Electrified powertrains deliver torque instantly, so compare torque figures alongside the powertrain type.
Fuel Economy & Range
A6 leads
If fuel economy & range is high on your list, the A6 makes the stronger case by a wide margin. The A6 brings better fuel economy. Better combined fuel economy lowers your running costs every week, and the savings add up over years of ownership. For fuel economy & range, the A6 is the one to beat.
Fuel economy (combined)
A6: 26 mpg G90: 21 mpg The A6 uses less fuel on the standard combined cycle, which matters most if you drive a lot.
Fuel economy (city)
A6: 24 mpg G90: 18 mpg In town, driving style has a big effect, but the A6 starts from a better baseline.
Space & Practicality
Too close to call
Neither pulls ahead on space & practicality; the numbers are close throughout. The space & practicality verdict: no winner, and no reason to worry either way.
Off-road & Towing
Too close to call
Swap one for the other and you’d lose nothing on off-road & towing. Treat off-road & towing as common ground and look elsewhere for the deciding factor.
Safety & Tech
The safety & tech comparison is about what’s inside rather than how much. See the table for the A6’s and the G90’s entries.
Full Specifications
Engine & Performance
| Spec | A6 | G90 |
|---|---|---|
| Powertrain | Gas (12V mild hybrid) | Gas |
| Engine | 2.0L turbo I4 | 3.5L twin-turbo V6 |
| Total system output | 261 hp | 375 hp (winner) |
| Torque | 273 lb-ft Least torque in class | 391 lb-ft (winner) |
| Transmission | 7-speed dual-clutch (S tronic) | 8-speed automatic |
| Drivetrain | AWD (quattro) | AWD |
Fuel Economy & Range
| Spec | A6 | G90 |
|---|---|---|
| Fuel economy (combined)EPA estimate where available | 26 mpg (winner) | 21 mpg |
| Fuel economy (city) | 24 mpg (winner) | 18 mpg |
| Fuel economy (highway) | 31 mpg (winner) | 26 mpg |
Space & Practicality
| Spec | A6 | G90 |
|---|---|---|
| Seats | 5 seats | 5 seats |
Off-road & Towing
| Spec | A6 | G90 |
|---|---|---|
| AWD / 4WD available | Yes | Yes |
Safety & Tech
| Spec | A6 | G90 |
|---|---|---|
| Basic warranty | 4 yr / 50,000 mi | 5 yr / 60,000 mi |
Dimensions
| Spec | A6 | G90 |
|---|---|---|
| Length | N/A (not specified) | 207.7 in |
| Width (no mirrors) | N/A (not specified) | 76.4 in |
| Height | N/A (not specified) | 58.7 in |
| Wheelbase | N/A (not specified) | 125.2 in |
“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 A6 if…
- you drive a lot and want lower running costs (26 mpg vs 21 mpg combined)
- you want better city fuel economy (24 mpg vs 18 mpg)
- you want better highway fuel economy (31 mpg vs 26 mpg)
Choose the G90 if…
- you want more power (375 hp vs 261 hp)
- you want more pulling power from low speeds (391 lb-ft vs 273 lb-ft of torque)
- you’re loyal to Genesis and happy with it
Also Compared
Frequently Asked Questions
Which is better for most people, the A6 or the G90?
There’s no single right answer. The A6 leads on fuel economy & range and the G90 on engine & performance.
Executive Summary
Here’s the short version of how I’d choose between the A6 and the G90. I’d put better fuel economy at the top of the list, and it belongs to the A6. Secondary, but worth mentioning: the A6 has better highway fuel economy. The G90 has a trump card of its own in 114 hp more power.
The A6 makes sense for anyone who values fuel economy & range; the G90 for anyone who values engine & performance.
My pick: I’d go with the A6 if I cared most about fuel economy & range, and the G90 if engine & performance mattered more.
Personal opinion based on the data above. Your priorities may differ.