2026 BMW 3 Series vs 2026 Cadillac CT4

$47,500 · Sedan

$35,600 · Sedan

Comparison Overview

Trying to decide between the established luxury of the 2026 BMW 3 Series and the sharp value proposition of the 2026 Cadillac CT4 is a classic dilemma. Buyers face an immediate $11,900 gulf in starting MSRP, with the BMW costing $47,500 versus the Cadillac’s $35,600 entry price. Performance numbers are closely matched: the BMW boasts 255 hp compared to the CT4's 237 hp, giving it a slight edge in power output. Where the difference truly stands out for daily driving is efficiency; the 3 Series achieves a combined 31 MPG, significantly better than the CT4's 26 MPG combined rating. Furthermore, the BMW offers 16.9 cu ft of cargo space, nearly 6.2 cubic feet more than the CT4's 10.7 cu ft. Despite the power difference, both utilize an 8-speed automatic transmission and rear-wheel drive architecture for a classic sporty feel.

Size Comparison

Performance

Fuel Efficiency

Full Specifications

Our Verdicts

🚗 Best for Commuters

2026 BMW 3 Series

The 2026 BMW 3 Series wins for commuters due to its superior fuel economy, achieving 31 MPG combined versus the CT4's 26 MPG combined.

👨‍👩‍👧‍👦 Best for Families

2026 BMW 3 Series

The 3 Series offers significantly more utility for families, providing 16.9 cu ft of cargo capacity compared to the CT4's 10.7 cu ft.

🏎️ Best for Enthusiasts

2026 BMW 3 Series

While both are RWD automatics, the BMW's higher output of 255 hp and 295 lb-ft of torque appeals more to driving enthusiasts.

💰 Best Value

2026 Cadillac CT4

The Cadillac CT4 provides exceptional entry-level luxury performance for $11,900 less than the starting price of the BMW 3 Series.

Choose the BMW 3 Series if...

You prioritize fuel savings and want a combined 31 MPG rating.
You need maximum trunk space, as the 16.9 cu ft capacity beats the CT4 substantially.
You want the segment benchmark in performance, delivering 255 hp right off the line.

Choose the Cadillac CT4 if...

Keeping the initial purchase price low is critical, saving $11,900 at $35,600 MSRP.
You prefer using recommended premium fuel over required premium fuel for cost management.
You are comfortable with the CT4's smaller 10.7 cu ft cargo area for regular hauling needs.

Key Dimensions

Dimension	BMW 3 Series	Cadillac CT4
Length	185.9"	187.2"
Width	71.9"	71.4"
Height	56.8"	56.0"
Wheelbase	112.2"	109.0"

Features Comparison

Safety

Feature	BMW	Cadillac
Lane Departure Warning	✓	✓
Lane Keeping Assist System	✓	✓
Driver Attention Alert	✓	—
Pre-Collision Safety System	✓	✓
Post-Collision Safety System	✓	✓
Dual Front 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
Brake Drying	✓	—
Front Ventilated Disc Brakes	✓	✓
Rear Ventilated Disc Brakes	✓	✓
Brake Preparation System	✓	—
Brake Assist	✓	✓
Tire Pressure Monitoring System	✓	✓
Automatic Headlights	✓	✓
Headlight Delay-Off	✓	✓
LED Headlights	✓	✓
Self-Leveling Headlights	✓	—
Daytime Running Lights	✓	✓
Integrated Turn Signal Mirrors	✓	✓
Front Headrests	2	2
Front Height Adjustable Headrests	✓	✓
Rear Headrests	3	2
Rear Height Adjustable Headrests	✓	✓
Rear Center 3-Point Seatbelt	✓	✓
Anti-Theft Alarm System (Remote)	✓	✓
Engine Immobilizer	✓	✓
Blind Spot Monitor	—	✓
Rear Cross Traffic Alert	—	✓
Dual Rear Side-Mounted Airbags	—	✓

Engine

Feature	BMW	Cadillac
Base Engine Displacement	2.0 L	2.0 L
Number of Cylinders	inline 4	inline 4
Base Engine Type	mild hybrid	gas
Horsepower	255 hp @ 4700 rpm	237 hp @ 5000 rpm
Torque	295 lb-ft @ 1600 rpm	258 lb-ft @ 1500 rpm
Number of Valves	16	16
Camshaft Type	Double overhead cam (DOHC)	Double overhead cam (DOHC)
Variable Valve Timing	Variable	Variable
Fuel Injection Type	✓	✓
Cylinder Deactivation	—	✓

Drive Train

Feature	BMW	Cadillac
Transmission Type	8-speed shiftable automatic	8-speed shiftable automatic
Drivetrain Type	rear wheel drive	rear wheel drive

Fuel

Feature	BMW	Cadillac
Fuel Type	premium unleaded (required)	premium unleaded (recommended)
EPA Fuel Economy (City/Highway)	28/35 MPG	22/32 MPG
EPA Fuel Economy (Combined)	31 MPG	26 MPG
EPA Driving Range (City/Highway)	436.8/546.0 mi.	374.0/544.0 mi.
Fuel Tank Capacity	15.6 gal.	17.0 gal.

Comfort & Convenience

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

In Car Entertainment

Feature	BMW	Cadillac
Infotainment Display	14.9 in	8.0 in
AM/FM Stereo	✓	✓
Stereo Power	205W	—
Speaker System	10	8
Subwoofer Count	2	—
Android Auto (Wireless)	✓	✓
Apple CarPlay (Wireless)	✓	✓
USB Port	✓	✓
USB Port with External Media Control	✓	✓
Satellite Radio	✓	✓
Satellite Radio Trial Period	12 months	3 months
Auxiliary Audio Input	—	✓
Memory Card Slot	—	✓
Speed Sensitive Volume Control	—	✓

Power Feature

Feature	BMW	Cadillac
One-Touch Power Windows	4	4
Moonroof Type	1st Row Power Glass	—
Keyless Entry	✓	✓
Heated Mirrors	✓	✓

Frontseats

Feature	BMW	Cadillac
Front Head Room	38.7 in.	38.3 in.
Front Leg Room	42.0 in.	42.4 in.
Front Shoulder Room	56.0 in.	55.2 in.
Seat Material: Leatherette	✓	✓
Front Seat Type: Sport	✓	—
Driver Seat Power Adjustments	10-way	8-way
Driver Seat Manual Adjustments	2-way	—
Driver Seat Height Adjustment	✓	✓
Driver Seat Lumbar Support	Power	Power
Driver Seat Thigh Extension	✓	—
Driver Seat Memory Settings	2	—
Passenger Seat Power Adjustments	10-way	6-way
Passenger Seat Manual Adjustments	2-way	—
Passenger Seat Height Adjustment	✓	✓
Passenger Seat Lumbar Support	Power	—
Passenger Seat Thigh Extension	✓	—
Driver Seat Heating	Multi-level	Multi-level
Passenger Seat Heating	Multi-level	Multi-level
Front Hip Room	—	53.0 in.
Front Seat Type: Bucket	—	✓

Rearseats

Feature	BMW	Cadillac
Rear Head Room	37.6 in.	36.5 in.
Rear Leg Room	35.2 in.	33.4 in.
Rear Shoulder Room	54.6 in.	53.9 in.
Split-Folding Rear Seatback	✓	✓
Folding Rear Seat Feature	✓	✓
Pass-Thru Center Armrest	✓	✓
Rear Hip Room	—	52.5 in.

Tires and Wheels

Feature	BMW	Cadillac
Wheel Finish	Painted Alloy	Painted Alloy
Wheel Size	18 x 7.5 in	—
Tire Size	225/45R18	P225/45R17
Run Flat Tires	✓	—
Wheel Diameter	—	17 in
Tire Type	—	✓

Suspension

Feature	BMW	Cadillac
Four-Wheel Independent Suspension	✓	✓
Front Stabilizer Bar	✓	✓
Rear Stabilizer Bar	✓	✓

Warranty

Feature	BMW	Cadillac
Basic Warranty	4 yr./ 50000 mi.	4 yr./ 50000 mi.
Drivetrain Warranty	4 yr./ 50000 mi.	6 yr./ 70000 mi.
Corrosion/Rust Warranty	12 yr./ unlimited mi.	4 yr./ 50000 mi.
Roadside Assistance	4 yr./ unlimited mi.	6 yr./ 70000 mi.
Complimentary Scheduled Maintenance	3 yr./ 36000 mi.	1 yr./ unlimited mi.

Frequently Asked Questions

Common questions about comparing the 2026 BMW 3 Series and 2026 Cadillac CT4.

Is the price difference between the 2026 BMW 3 Series and the Cadillac CT4 worth the performance gap?

The BMW 3 Series starts at $47,500, a $11,900 premium over the CT4’s $35,600 MSRP. While the BMW offers 18 more horsepower (255 hp vs. 237 hp), the CT4's substantial initial savings often outweigh the modest performance boost for non-track driving.

Which sedan is better for long highway commutes based on fuel economy?

The 2026 BMW 3 Series is clearly superior for high-mileage commuters, boasting a combined 31 MPG (28 city/35 highway). The Cadillac CT4 returns 26 MPG combined (22 city/32 highway), meaning the BMW will save you more money at the pump over the year.

How much more cargo space does the BMW 3 Series offer than the CT4?

The 3 Series provides 16.9 cubic feet of cargo capacity, which is substantially more practical for errands or trips than the CT4’s 10.7 cubic feet. That nearly 40% increase in trunk volume is a significant differentiator for families.

Do both cars require premium fuel?

No, there is a difference in fuel mandates. The 2026 BMW 3 Series explicitly requires premium unleaded fuel for its higher compression engine. The 2026 Cadillac CT4 only lists premium unleaded as recommended, meaning regular might be permissible, offering flexibility.

Are the physical dimensions similar enough to affect parking or garage fit?

The vehicles are very similar in footprint, with the CT4 being slightly longer (187.2 inches vs. 185.9 inches) and marginally narrower (71.4 inches vs. 71.9 inches). However, the BMW is noticeably taller at 56.8 inches compared to the CT4’s 56.0 inches.

Which car offers better torque and is that noticeable in city driving?

The 2026 BMW 3 Series leads in torque production with 295 lb-ft versus the CT4's 258 lb-ft. This extra low-end pull in the BMW will likely make merging and passing feel more effortless in stop-and-go city traffic.