BMW 3 Series vs Cadillac CT4
The BMW 3 Series is the more efficient of the two: it reaches 36 mpg combined versus 27 mpg for the Cadillac CT4, a 9 mpg advantage and costs about $600 less per year to fuel.
Across 5 measured categories, the BMW 3 Series leads in 5. Figures are EPA test data, not manufacturer claims.
Head-to-head specifications
| Metric | BMW 3 Series | Cadillac CT4 |
|---|---|---|
| Best combined MPG | 36 mpg ✓ | 27 mpg |
| Best city MPG | 31 mpg ✓ | 23 mpg |
| Best highway MPG | 43 mpg ✓ | 34 mpg |
| Lowest annual fuel costEPA estimate at 15,000 miles per year | $2,200 ✓ | $2,800 |
| Lowest CO2 output | 158 g/mi ✓ | 327 g/mi |
| Engines offered | SIDI & PFI; Mild Hybrid, SIDI, SIDI; PHEV, SIDI; Mild Hybrid | SIDI |
| Transmissions | Automatic (S8), Manual 6-spd | Automatic (S8), Manual 6-spd, Automatic (S10) |
| Drivetrains | Rear-Wheel Drive, All-Wheel Drive | All-Wheel Drive, Rear-Wheel Drive |
| Fuel types | Premium, Premium and Electricity, Diesel | Premium |
| EPA class | Compact Cars | Compact Cars |
| Years covered | 2015–2026 | 2020–2026 |
| Configurations on record | 105 | 52 |
Source: EPA fuel economy records via fueleconomy.gov. Best-case values across all recorded configurations for each model.
3 Series vs CT4: common questions
Which is better on gas, the BMW 3 Series or the Cadillac CT4?
The BMW 3 Series is the more efficient of the two: it reaches 36 mpg combined versus 27 mpg for the Cadillac CT4, a 9 mpg advantage and costs about $600 less per year to fuel.
Which costs less to run per year?
By EPA estimates at 15,000 miles a year, the BMW 3 Series runs about $2,200 a year in fuel at its most efficient configuration, versus about $2,800 for the Cadillac CT4 — a difference of roughly $600 per year.
What engines do the 3 Series and CT4 offer?
BMW 3 Series: SIDI & PFI; Mild Hybrid, SIDI, SIDI; PHEV, SIDI; Mild Hybrid. Cadillac CT4: SIDI.
Are they in the same vehicle class?
Yes — the EPA classifies both the BMW 3 Series and the Cadillac CT4 as Compact Cars, so they compete directly.
More 3 Series comparisons
Comparison id: bmw-3-series-vs-cadillac-ct4