VS
At a Glance
Power
386hp @ 5200
237hp @ 5000
Torque
398lb-ft @ 1900
258lb-ft @ 1500-4000
Fuel
30 mpg est.
26 mpg est.
Engine
3.0 L/183ci
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Choosing between the BMW 3 Series and the Cadillac Ct5 is one of the most common decisions car buyers in the United States face. The BMW 3 Series delivers 386hp @ 5200 while the Cadillac Ct5 produces 237hp @ 5000. On fuel, the 3 Series returns 30 mpg est. while the Ct5 uses 26 mpg est. — important in a market where fuel prices change monthly. Pricing starts at $47,500 for the 3 Series and $49,200 for the Ct5. Both vehicles have their merits. The right choice depends on your priorities: fuel economy, performance, towing ability, safety features or total cost of ownership. This comparison covers every specification available so you can make an informed decision.
Specification
BMW 3 SeriesM340i NA xDrive Sedan 2026 - From $47,500
Cadillac Ct54dr Sdn Premium Luxury 2026 - From $49,200
Performance
Power Output (hp)
386hp @ 5200
237hp @ 5000
Torque (lb-ft)
398lb-ft @ 1900
258lb-ft @ 1500-4000
Engine & Drivetrain
Engine Capacity
3.0 L/183ci
—
Engine Layout
Inline
V
Cylinders
6
6
Fuel Type
—
Gasoline
Forced Induction Device
Turbocharged
Turbocharged
Transmission
Automatic
Automatic
Number of Gears
8
—
Drive Wheels
All Wheel Drive
Rear Wheel Drive
Fuel Economy
Fuel Economy (Combined, est.)
30 mpg est.
26 mpg est.
Fuel Economy - City (mpg)
26mpg
22mpg
Fuel Economy - Highway (mpg)
33mpg
31mpg
Fuel Tank Capacity (gal)
15.6gal
17.4gal
Dimensions
Length (in)
185.9in
193.8in
Width (in)
71.9in
74.1in
Height (in)
56.7in
57.2in
Wheelbase (in)
112.5in
116in
Curb Weight (lbs)
4008lbs
3663lbs
Safety
ABS
✓ Standard
✓ Standard
Brake Assist
✓ Standard
✓ Standard
Stability Control
✓ Standard
—
Traction Control
✓ Standard
—
Driver Airbag
✓ Standard
✓ Standard
Passenger Airbag
✓ Standard
✓ Standard
Side Airbags Front
✓ Standard
✓ Standard
Curtain Airbags
✓ Standard
✓ Standard
Features & Tech
Air Conditioning
✓ Standard
✓ Standard
Climate Control
✓ Standard
✓ Standard
Cruise Control
✓ Standard
✓ Standard
Adaptive Cruise Control
✓ Standard
✓ Standard
Bluetooth
✓ Standard
✓ Standard
Backup Camera
✓ Standard
✓ Standard
Rear Parking Aid
✓ Standard
✓ Standard
Sunroof
✓ Standard
✓ Standard
Heated Seats
✓ Standard
✓ Standard
Power Seat Adjustment
✓ Standard
✓ Standard
Keyless Entry
✓ Standard
✓ Standard
Alloy Wheels
✓ Standard
✓ Standard
The Verdict
Which Wins?
Overall Winner
BMW 3 Series
3 / 4 categories
Performance
3 Series
Fuel Economy
3 Series
Value
3 Series
Practicality
Tied
Pros & Cons
BMW 3 Series
Better fuel economy (30 mpg est.)
Lower starting price ($47,500)
Few notable weaknesses
Cadillac Ct5
Well-rounded specification
Higher fuel consumption (26 mpg est.)
Higher starting price
Frequently Asked Questions
Which is more fuel efficient, the 3 Series or Ct5?
The 3 Series gets 30 mpg est. and the Ct5 gets 26 mpg est. on the combined cycle. The 3 Series is the more fuel-efficient choice. In real-world conditions with a mix of highway and urban driving, actual figures will be slightly higher.
Which has more power, the 3 Series or Ct5?
The 3 Series produces 386hp @ 5200 and 398lb-ft @ 1900 of torque while the Ct5 delivers 237hp @ 5000 and 258lb-ft @ 1500-4000 of torque. The 3 Series is the more powerful option.
What is the price difference between the 3 Series and Ct5?
The 3 Series starts from $47,500 and the Ct5 from $49,200. The 3 Series is cheaper by $1,700 at this variant level. Final on-the-road pricing varies by dealer and specification.
Should I buy the 3 Series or the Ct5?
It depends on your priorities. If fuel economy matters most, check the mpg figures above. If you need towing capacity, compare the towing ratings. For day-to-day driving - commutes, school runs and highway trips - consider ground clearance, service network coverage, and total cost of ownership including insurance and maintenance. Use the spec tables above to compare every detail before making your decision.
Also Consider