BMW 8 Series vs Cadillac CT5
The Cadillac CT5 is the more efficient of the two: it reaches 27 mpg combined versus 25 mpg for the BMW 8 Series, a 2 mpg advantage and costs about $250 less per year to fuel.
Across 4 measured categories, the Cadillac CT5 leads in 4. Figures are EPA test data, not manufacturer claims.
Head-to-head specifications
| Metric | BMW 8 Series | Cadillac CT5 |
|---|---|---|
| Best combined MPG | 25 mpg | 27 mpg ✓ |
| Best city MPG | 23 mpg | 23 mpg |
| Best highway MPG | 30 mpg | 33 mpg ✓ |
| Lowest annual fuel costEPA estimate at 15,000 miles per year | $3,050 | $2,800 ✓ |
| Lowest CO2 output | 347 g/mi | 333 g/mi ✓ |
| Engines offered | SIDI | 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 | Premium |
| EPA class | Subcompact Cars | Midsize Cars |
| Years covered | 2019–2026 | 2020–2026 |
| Configurations on record | 64 | 52 |
Source: EPA fuel economy records via fueleconomy.gov. Best-case values across all recorded configurations for each model.
8 Series vs CT5: common questions
Which is better on gas, the BMW 8 Series or the Cadillac CT5?
The Cadillac CT5 is the more efficient of the two: it reaches 27 mpg combined versus 25 mpg for the BMW 8 Series, a 2 mpg advantage and costs about $250 less per year to fuel.
Which costs less to run per year?
By EPA estimates at 15,000 miles a year, the Cadillac CT5 runs about $2,800 a year in fuel at its most efficient configuration, versus about $3,050 for the BMW 8 Series — a difference of roughly $250 per year.
What engines do the 8 Series and CT5 offer?
BMW 8 Series: SIDI. Cadillac CT5: SIDI.
Are they in the same vehicle class?
The EPA classifies the BMW 8 Series as Subcompact Cars and the Cadillac CT5 as Midsize Cars, so they aren't a like-for-like match on size.
More 8 Series comparisons
Comparison id: bmw-8-series-vs-cadillac-ct5