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BMW 3 Series vs Cadillac CT5

2026 BMW 3 Series vs 2026 Cadillac CT5 — two rivals compared on efficiency, size, safety and reliability.

BMW 3 Series

2026 BMW 3 Series

Compact CarsAWD/4WDHybrid/EV
VS5 – 0BMW 3 Series wins 5 of 5 categories
Cadillac CT5

2026 Cadillac CT5

Midsize CarsAWD/4WD

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The short version

The BMW 3 Series is more fuel-efficient: 31 vs 26 MPG combined in its best version.

That works out to about $500 a year less in fuel for the BMW 3 Series (EPA estimate, 15,000 miles).

The Cadillac CT5 is the bigger car, about 8 inches longer.

Across all model years since 2005, the BMW 3 Series has had fewer recall campaigns (4 vs 6).

The two cars

The 2026 BMW 3 Series is a compact car offered with 2 engines (2.0L 4-cyl turbo and 3.0L 6-cyl turbo), including a hybrid version and rear-wheel drive and all-wheel drive. It measures about 185 inches long and 72 inches wide on a 112-inch wheelbase, with a curb weight of roughly 3,494 lb (3-Series 330i Xdrive 4dr Sedan).

The 2026 Cadillac CT5 is a midsize car offered with 3 engines (2.0L 4-cyl turbo, 3.0L 6-cyl turbo and 6.2L 8-cyl) and rear-wheel drive and all-wheel drive. It measures about 194 inches long and 74 inches wide on a 116-inch wheelbase, with a curb weight of roughly 3,799 lb (4dr Sedan AWD).

Buying used? The 2024 3 Series and the 2024 CT5 have the fewest problems in our data; avoid the 2020 CT5.

Basics

Compact Cars
Class
Midsize Cars
Hybrid
Fuel
Premium Gasoline
2.0L 4-cyl turbo, 3.0L 6-cyl turbo
Engines
2.0L 4-cyl turbo, 3.0L 6-cyl turbo, 6.2L 8-cyl
Rear-Wheel Drive, All-Wheel Drive
Drivetrain
Rear-Wheel Drive, All-Wheel Drive

Efficiency

31 MPG
Best combined MPG
26 MPG
28 city
City / highway MPG (best)
22 city
$2,650
Fuel cost per year (EPA)
$3,150

Performance & space

185.4 in
Length
193.7 in
72 in
Width
74 in
56.7 in
Height
57.1 in
3,494 lb
Curb weight (lightest)
3,660 lb

Safety & reliability

–
Driver-assist features standard
15
0
Recalls (2026)
1
4
Recalls, all years since 2005
6
0
Owner complaints (latest year)
6

Interest

47,774
Wikipedia views, 30 days
9,415

Buying used

2024
Best used year
2024
–
Year to avoid
2020

Green = clearly better. Prices are not included. How we calculate this →

Which one should you choose?

Choose the BMW 3 Series if…

  • You want lower fuel bills (31 vs 26 MPG)
  • You want something easier to park (8 in shorter)
  • You want a hybrid or electric option

Choose the Cadillac CT5 if…

  • You want more room (8 in longer)

Pros & cons of each

2026 BMW 3 Series

  • Hybrid version availableOffered as a hybrid as well as gas.
  • AWD / 4WD available
  • Premium fuel requiredEvery gasoline version is rated for premium, which raises running costs.

2026 Cadillac CT5

  • AWD / 4WD available
  • Lots of standard safety tech4 of 5 key driver aids standard on the versions we checked.
  • Below-average fuel economyBest version gets 26 MPG combined, 17% below the 2026 midsize car average of 31.2 MPG.
  • Premium fuel requiredEvery gasoline version is rated for premium, which raises running costs.

Full 2026 BMW 3 Series specs →Full 2026 Cadillac CT5 specs →Compare fuel costs for your driving →Compare size & garage fit →