BMW 5 Series vs Cadillac CT5
The BMW 5 Series is the more efficient of the two: it reaches 31 mpg combined versus 27 mpg for the Cadillac CT5, a 4 mpg advantage and costs about $350 less per year to fuel.
Across 5 measured categories, the BMW 5 Series leads in 5. Figures are EPA test data, not manufacturer claims.
Head-to-head specifications
| Metric | BMW 5 Series | Cadillac CT5 |
|---|---|---|
| Best combined MPG | 31 mpg ✓ | 27 mpg |
| Best city MPG | 29 mpg ✓ | 23 mpg |
| Best highway MPG | 38 mpg ✓ | 33 mpg |
| Lowest annual fuel costEPA estimate at 15,000 miles per year | $2,450 ✓ | $2,800 |
| Lowest CO2 output | 133 g/mi ✓ | 333 g/mi |
| Engines offered | SIDI & PFI; PHEV, SIDI & PFI; Mild Hybrid, SIDI; PHEV, 2.0 | SIDI |
| Transmissions | Automatic (S8) | Automatic (S10), Manual 6-spd |
| Drivetrains | All-Wheel Drive, Rear-Wheel Drive | All-Wheel Drive, Rear-Wheel Drive |
| Fuel types | Premium and Electricity, Premium, Diesel | Premium |
| EPA class | Midsize Cars | Midsize Cars |
| Years covered | 2015–2027 | 2020–2026 |
| Configurations on record | 85 | 52 |
Source: EPA fuel economy records via fueleconomy.gov. Best-case values across all recorded configurations for each model.
5 Series vs CT5: common questions
Which is better on gas, the BMW 5 Series or the Cadillac CT5?
The BMW 5 Series is the more efficient of the two: it reaches 31 mpg combined versus 27 mpg for the Cadillac CT5, a 4 mpg advantage and costs about $350 less per year to fuel.
Which costs less to run per year?
By EPA estimates at 15,000 miles a year, the BMW 5 Series runs about $2,450 a year in fuel at its most efficient configuration, versus about $2,800 for the Cadillac CT5 — a difference of roughly $350 per year.
What engines do the 5 Series and CT5 offer?
BMW 5 Series: SIDI & PFI; PHEV, SIDI & PFI; Mild Hybrid, SIDI; PHEV, 2.0. Cadillac CT5: SIDI.
Are they in the same vehicle class?
Yes — the EPA classifies both the BMW 5 Series and the Cadillac CT5 as Midsize Cars, so they compete directly.
More 5 Series comparisons
Comparison id: bmw-5-series-vs-cadillac-ct5