2025 Audi S3 vs 2026 Mercedes-Benz C-Class

$48,700 · Sedan

$49,650 · Sedan

Comparison Overview

The 2025 Audi S3 storms onto the scene prioritizing raw performance, boasting a potent 328 hp and 295 lb-ft of torque channeled through its Quattro all-wheel drive system, making it the definitive driver's tool. Conversely, the 2026 Mercedes-Benz C-Class leans into sophisticated refinement and efficiency; while slightly less powerful at 255 hp, it offers superior fuel economy, netting 29 MPG combined compared to the Audi's 26 MPG. The C-Class also presents a more practical package, being significantly larger at 187.0 inches long and offering 11.6 cu ft of cargo space versus the S3's 8.3 cu ft. Despite the $49,650 MSRP being slightly higher than the S3's $48,700, the Mercedes offers a more composed journey with RWD dynamics and a 9-speed automatic, whereas the S3 leverages its 7-speed automated manual transmission to deploy its substantial 73 hp advantage immediately.

Size Comparison

Performance

Fuel Efficiency

Full Specifications

Our Verdicts

🚗 Best for Commuters

2026 Mercedes-Benz C-Class

The 2026 Mercedes-Benz C-Class wins for commuters due to its better combined fuel economy of 29 MPG and larger trunk space at 11.6 cu ft.

👨‍👩‍👧‍👦 Best for Families

2026 Mercedes-Benz C-Class

The C-Class provides a more accommodating family ride with nearly 3.3 cubic feet more cargo space and a longer body providing greater rear passenger room.

🏎️ Best for Enthusiasts

2025 Audi S3

The 2025 Audi S3 is the clear choice for enthusiasts thanks to its impressive 328 hp output and standard all-wheel drive grip.

💰 Best Value

2025 Audi S3

The Audi S3 offers significantly more horsepower (328 hp vs 255 hp) for a slightly lower starting price of $48,700.

Choose the Audi S3 if...

You prioritize explosive acceleration and performance, capitalizing on the 328 hp engine.
You value the added security and traction provided by the standard all-wheel drive system.
You prefer the quick, direct shifts of a 7-speed automated manual transmission over a traditional automatic.

Choose the Mercedes-Benz C-Class if...

You need maximum usability, benefiting from the substantial 11.6 cu ft of cargo capacity.
You want better long-distance efficiency, as indicated by the 35 MPG highway rating.
You prefer the classic handling balance and feedback associated with a rear-wheel-drive platform.

Key Dimensions

Dimension	Audi S3	Mercedes-Benz C-Class
Length	177.4"	187.0"
Width	71.5"	74.4"
Height	55.7"	56.6"
Wheelbase	103.6"	112.8"

Features Comparison

Safety

Feature	Audi	Mercedes-Benz
Blind Spot Monitor	✓	✓
Lane Departure Warning	✓	—
Rear Cross Traffic Alert	✓	—
Pre-Collision Safety System	✓	✓
Post-Collision Safety System	✓	✓
Dual Front Side-Mounted Airbags	✓	✓
Dual Rear Side-Mounted Airbags	✓	—
Front Head Airbags	✓	✓
Rear Head Airbags	✓	✓
Passenger Airbag Occupant Sensing Deactivation	✓	✓
Electronic Stability Control	✓	✓
Traction Control System	✓	✓
LATCH System	✓	✓
Rear Door Child Safety Locks	✓	✓
Anti-lock Brakes (ABS)	4-Wheel	4-Wheel
Front Ventilated Disc Brakes	✓	✓
Rear Ventilated Disc Brakes	✓	✓
Brake Assist	✓	✓
Tire Pressure Monitoring System	✓	✓
Automatic Headlights	✓	✓
LED Headlights	✓	✓
Daytime Running Lights	✓	✓
Headlight Washers	✓	—
Integrated Turn Signal Mirrors	✓	✓
Front Headrests	2	2
Front Fixed Headrests	✓	—
Rear Headrests	3	3
Rear Height Adjustable Headrests	✓	✓
Rear Center 3-Point Seatbelt	✓	✓
Anti-Theft Alarm System (Remote)	✓	✓
Engine Immobilizer	✓	✓
Driver Attention Alert	—	✓
Brake Drying	—	✓
Brake Preparation System	—	✓
Headlight Delay-Off	—	✓
Front Power Adjustable Headrests	—	✓

Engine

Feature	Audi	Mercedes-Benz
Base Engine Displacement	2.0 L	2.0 L
Number of Cylinders	inline 4	inline 4
Base Engine Type	gas	mild hybrid
Horsepower	328 hp	255 hp @ 5800 rpm
Torque	295 lb-ft	295 lb-ft @ 2000 rpm
Number of Valves	16	16
Camshaft Type	Double overhead cam (DOHC)	Double overhead cam (DOHC)
Variable Valve Timing	Variable	Variable
Fuel Injection Type	✓	✓

Drive Train

Feature	Audi	Mercedes-Benz
Transmission Type	7-speed automated manual	9-speed shiftable automatic
Drivetrain Type	all wheel drive	rear wheel drive
Center Differential Type	Limited Slip	—

Fuel

Feature	Audi	Mercedes-Benz
Fuel Type	premium unleaded (required)	premium unleaded (required)
EPA Fuel Economy (City/Highway)	23/31 MPG	25/35 MPG
EPA Fuel Economy (Combined)	26 MPG	29 MPG
EPA Driving Range (City/Highway)	333.5/449.5 mi.	435.0/609.0 mi.
Fuel Tank Capacity	14.5 gal.	17.4 gal.

Comfort & Convenience

Feature	Audi	Mercedes-Benz
Push Button Start	✓	✓
Tilt and Telescopic Steering Wheel	✓	—
Transmission Controls on Steering Wheel	✓	✓
Audio Controls on Steering Wheel	✓	✓
Electric Power Steering	✓	✓
Rear View Camera	✓	✓
Front Parking Sensors	✓	✓
Rear Parking Sensors	✓	✓
Driver Assisted Parking Assist	✓	—
Cruise Control	✓	✓
Front Cupholders	✓	✓
Rear Cupholders	✓	✓
Front Door Pockets	✓	✓
Rear Door Pockets	✓	✓
Front Seatback Storage	✓	✓
Leather Steering Wheel	✓	✓
Three Zone Climate Control	✓	—
Rear Ventilation Ducts	✓	✓
Interior Air Filtration	✓	✓
Dual Vanity Mirrors	✓	✓
Turn Signal Indicators in Mirrors	✓	✓
Power Tilt and Telescopic Steering Wheel	—	✓
Cruise Control on Steering Wheel	—	✓
Automatic Parking Assist	—	✓
Wireless Charging Pad	—	✓
Universal Remote Transmitter	—	✓
Dual Zone Climate Control	—	✓
Auto-Dimming Rearview Mirror	—	✓

In Car Entertainment

Feature	Audi	Mercedes-Benz
Infotainment Display	10.1 in	11.9 in
AM/FM Stereo	✓	✓
Speaker System	6	5
Android Auto (Wireless)	✓	✓
Apple CarPlay (Wireless)	✓	✓
USB Port	✓	✓
USB Port with External Media Control	✓	✓
Subwoofer Count	—	1
Satellite Radio	—	✓
Satellite Radio Trial Period	—	6 months

Power Feature

Feature	Audi	Mercedes-Benz
One-Touch Power Windows	4	4
Moonroof Type	1st Row Power Glass Extended	1st Row Power Glass
Remote Keyless Entry	✓	—
Heated Mirrors	✓	✓
Keyless Entry	—	✓

Frontseats

Feature	Audi	Mercedes-Benz
Front Head Room	36.8 in.	40.0 in.
Front Leg Room	41.2 in.	41.7 in.
Front Shoulder Room	54.8 in.	56.3 in.
Seat Material: Leather/Sueded Microfiber	✓	—
Front Seat Type: Sport	✓	—
Driver Seat Power Adjustments	8-way	10-way
Driver Seat Height Adjustment	✓	✓
Driver Seat Lumbar Support	Power	Power
Passenger Seat Power Adjustments	8-way	10-way
Passenger Seat Height Adjustment	✓	✓
Passenger Seat Lumbar Support	Power	Power
Driver Seat Heating	Multi-level	Multi-level
Passenger Seat Heating	Multi-level	Multi-level
Seat Material: Leatherette	—	✓
Front Seat Type: Bucket	—	✓
Driver Seat Thigh Extension	—	✓
Driver Seat Memory Settings	—	3
Passenger Seat Memory Settings	—	3

Rearseats

Feature	Audi	Mercedes-Benz
Rear Head Room	36.6 in.	37.5 in.
Rear Leg Room	35.2 in.	36.0 in.
Rear Shoulder Room	53.0 in.	55.6 in.
Split-Folding Rear Seatback	✓	✓
Folding Rear Seat Feature	✓	—
Pass-Thru Center Armrest	✓	—
Folding Center Armrest	—	✓

Tires and Wheels

Feature	Audi	Mercedes-Benz
Wheel Material	Alloy	Alloy
Wheel Diameter	18 in	—
Tire Size	225/40R18	245/40R18
Run Flat Tires	✓	✓
Wheel Size	—	18 x 8.5 in

Suspension

Feature	Audi	Mercedes-Benz
Four-Wheel Independent Suspension	✓	✓
Front Stabilizer Bar	✓	✓
Rear Stabilizer Bar	✓	✓

Warranty

Feature	Audi	Mercedes-Benz
Basic Warranty	4 yr./ 50000 mi.	4 yr./ 50000 mi.
Drivetrain Warranty	4 yr./ 50000 mi.	4 yr./ 50000 mi.
Corrosion/Rust Warranty	12 yr./ unlimited mi.	4 yr./ 50000 mi.
Roadside Assistance	4 yr./ unlimited mi.	4 yr./ 50000 mi.
Hybrid Component Warranty	—	6 yr./ 62000 mi.

Frequently Asked Questions

Common questions about comparing the 2025 Audi S3 and 2026 Mercedes-Benz C-Class.

How significant is the power difference between these two sedans?

The difference is substantial; the 2025 Audi S3 delivers 328 hp, a full 73 hp more than the 2026 Mercedes-Benz C-Class's 255 hp rating. Both vehicles manage to achieve the same 295 lb-ft of torque.

Which sedan is the better choice for long highway commutes?

The 2026 Mercedes-Benz C-Class is engineered for better highway cruising efficiency, achieving 35 MPG highway, significantly outpacing the Audi S3's 31 MPG highway rating.

Does the Audi S3 require premium fuel, and what is its consumption like?

Yes, both vehicles mandate premium unleaded fuel. The S3's performance focus results in a lower combined rating of 26 MPG compared to the C-Class's 29 MPG combined figure.

Which sedan offers more interior practicality and cargo space?

The 2026 Mercedes-Benz C-Class offers superior practicality with 11.6 cu ft of cargo capacity, considerably more than the compact 8.3 cu ft available in the Audi S3.

What are the fundamental differences in their drivetrain layouts?

The Audi S3 features an all-wheel drive system paired with a 7-speed automated manual transmission. In contrast, the Mercedes C-Class utilizes a rear-wheel-drive layout managed by a 9-speed shiftable automatic transmission.