A4 vs CT5
Shopping across brands means comparing different philosophies. The A4 and the CT5 show how Audi and Cadillac each approach the compact luxury car class. Neither wins across the board. The A4 makes its case with fuel economy & range; the CT5 makes its case with engine & performance.
At a glance
- Engine & Performance CT5 wins
- Fuel Economy & Range A4 wins
- Space & Practicality Tie
- Off-road & Towing Tie
- Engine & Performance3.1
- Fuel Economy & Range7.9
- Engine & Performance5.0
- Fuel Economy & Range5.0
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 CT5 has 36 hp more power
On total system output, the CT5 posts 237 hp against 201 hp for the A4, a gap big enough to feel in everyday use. More power helps with merging, overtaking and climbing hills, especially with passengers and luggage on board.
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The A4 has better fuel economy
Not a big gap, but a consistent one. The A4’s 29 mpg beats the CT5’s 26 mpg. Official figures rarely match real-world driving exactly, but the ranking between two cars tends to hold.
-
The CT5 has 22 lb-ft more torque
The CT5 wins this narrowly, 258 lb-ft against 236 lb-ft, which makes it more of a bonus than a reason to buy. The CT5’s extra torque makes it more relaxed when fully loaded or towing.
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The A4 has better city fuel economy
The A4 has a modest edge on fuel economy (city): 26 mpg against 23 mpg for the CT5. Hybrids often shine in the city, and the A4 has the better rating here.
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The A4 has better highway fuel economy
It’s a small lead (36 mpg versus 32 mpg), but it’s real, and it goes to the A4. The A4 uses less fuel on the highway, a real saving on road trips and long commutes.
Design & Size
Dimensions
| Spec | A4 | CT5 |
|---|---|---|
| Length | N/A (not specified) | 193.8 in |
| Width (no mirrors) | N/A (not specified) | 74.1 in |
| Height | N/A (not specified) | 57.2 in |
| Wheelbase | N/A (not specified) | 116 in |
Engine & Performance
CT5 leads
The engine & performance numbers point firmly in one direction: toward the CT5. On the CT5, you get 36 hp more power. The CT5’s extra output gives it more in reserve when you need to get up to speed. On engine & performance alone, the CT5 gets the nod.
Total system output
A4: 201 hp CT5: 237 hp Power is only part of the story; weight, gearing and torque delivery shape how quick a car feels.
Torque
A4: 236 lb-ft CT5: 258 lb-ft Electrified powertrains deliver torque instantly, so compare torque figures alongside the powertrain type.
Fuel Economy & Range
A4 leads
Here the A4 opens up one of its biggest leads in the comparison. The A4 adds better fuel economy. Better combined fuel economy lowers your running costs every week, and the savings add up over years of ownership. Prioritize fuel economy & range, and the A4 is where you should land.
Fuel economy (combined)
A4: 29 mpg CT5: 26 mpg The A4 uses less fuel on the standard combined cycle, which matters most if you drive a lot.
Fuel economy (city)
A4: 26 mpg CT5: 23 mpg In town, driving style has a big effect, but the A4 starts from a better baseline.
Space & Practicality
Too close to call
The differences on space & practicality are small enough to ignore in daily use. Either car will serve you equally well on space & practicality.
Off-road & Towing
Too close to call
Evenly matched is the fairest summary of the off-road & towing section. The off-road & towing verdict: no winner, and no reason to worry either way.
Safety & Tech
We don’t score this area directly, because the safety & tech specs are labels rather than measurements. The table shows what each lists.
Full Specifications
Engine & Performance
| Spec | A4 | CT5 |
|---|---|---|
| Powertrain | Gas (12V mild hybrid) | Gas |
| Engine | 2.0L turbo I4 | 2.0L turbo I4 |
| Total system output | 201 hp | 237 hp (winner) |
| Torque | 236 lb-ft | 258 lb-ft (winner) |
| Transmission | 7-speed dual-clutch (S tronic) | 10-speed automatic |
| Drivetrain | AWD (quattro) | RWD (AWD available) |
Fuel Economy & Range
| Spec | A4 | CT5 |
|---|---|---|
| Fuel economy (combined)EPA estimate where available | 29 mpg (winner) | 26 mpg |
| Fuel economy (city) | 26 mpg (winner) | 23 mpg |
| Fuel economy (highway) | 36 mpg (winner) | 32 mpg |
Space & Practicality
| Spec | A4 | CT5 |
|---|---|---|
| Seats | 5 seats | 5 seats |
| Cargo (behind rear seats) | N/A (not specified) | 11.9 cu ft |
Off-road & Towing
| Spec | A4 | CT5 |
|---|---|---|
| AWD / 4WD available | Yes | Yes |
Safety & Tech
| Spec | A4 | CT5 |
|---|---|---|
| Basic warranty | 4 yr / 50,000 mi | 4 yr / 50,000 mi |
Dimensions
| Spec | A4 | CT5 |
|---|---|---|
| Length | N/A (not specified) | 193.8 in |
| Width (no mirrors) | N/A (not specified) | 74.1 in |
| Height | N/A (not specified) | 57.2 in |
| Wheelbase | N/A (not specified) | 116 in |
Price
| Spec | A4 | CT5 |
|---|---|---|
| Starting MSRP | N/A (not specified) | $47,595 Priciest in class |
“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 A4 if…
- you want better combined fuel economy (29 mpg vs 26 mpg)
- you want better city fuel economy (26 mpg vs 23 mpg)
- you want better highway fuel economy (36 mpg vs 32 mpg)
Choose the CT5 if…
- you want more power (237 hp vs 201 hp)
- you want more pulling power from low speeds (258 lb-ft vs 236 lb-ft of torque)
- you trust Cadillac and want to keep things familiar
Also Compared
Frequently Asked Questions
Should I buy the A4 or the CT5?
The A4 and the CT5 split the comparison (fuel economy & range for the A4, engine & performance for the CT5), so pick the strength you’ll use.
Executive Summary
Comparing the A4 and the CT5 feels a bit like comparing two good restaurants with different menus. What tips it for me is that the A4 has better fuel economy. And if that weren’t enough, the A4 has better highway fuel economy. On the other side, the CT5 brings 36 hp more power, and I wouldn’t dismiss that.
If fuel economy & range is your thing, the A4 fits. If engine & performance matters more, the CT5 makes more sense.
My pick: I’d go with the A4 if I cared most about fuel economy & range, and the CT5 if engine & performance mattered more.
Personal opinion based on the data above. Your priorities may differ.