DecodedCarsBMW 5 Series vs Cadillac CT5
2026 BMW 5 Series vs 2026 Cadillac CT5 — two midsize cars compared on efficiency, size, safety and reliability.
The short version
The BMW 5 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 5 Series (EPA estimate, 15,000 miles).
The BMW 5 Series is the bigger car, about 6 inches longer.
Across all model years since 2005, the Cadillac CT5 has had fewer recall campaigns (6 vs 9).
The two cars
The 2026 BMW 5 Series is a midsize 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 199 inches long and 75 inches wide on a 118-inch wheelbase, with a curb weight of roughly 4,158 lb (5-Series 530i 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 5 Series and the 2024 CT5 have the fewest problems in our data; avoid the 2020 CT5.
Basics
Efficiency
Performance & space
Safety & reliability
Interest
Green = clearly better. Prices are not included. How we calculate this →
Which one should you choose?
Choose the BMW 5 Series if…
- You want lower fuel bills (31 vs 26 MPG)
- You want more room (6 in longer)
- You want a hybrid or electric option
Choose the Cadillac CT5 if…
- You want something easier to park (6 in shorter)
Pros & cons of each
2026 BMW 5 Series
- Hybrid version availableOffered as a hybrid and plug-in 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 5 Series specs →Full 2026 Cadillac CT5 specs →Compare fuel costs for your driving →Compare size & garage fit →