Mazda 3 vs Cadillac CT5
The Mazda 3 is the more efficient of the two: it reaches 33 mpg combined versus 27 mpg for the Cadillac CT5, a 6 mpg advantage and costs about $950 less per year to fuel.
Across 5 measured categories, the Mazda 3 leads in 5. Figures are EPA test data, not manufacturer claims.
Head-to-head specifications
| Metric | Mazda 3 | Cadillac CT5 |
|---|---|---|
| Best combined MPG | 33 mpg ✓ | 27 mpg |
| Best city MPG | 30 mpg ✓ | 23 mpg |
| Best highway MPG | 40 mpg ✓ | 33 mpg |
| Lowest annual fuel costEPA estimate at 15,000 miles per year | $1,850 ✓ | $2,800 |
| Lowest CO2 output | 266 g/mi ✓ | 333 g/mi |
| Engines offered | SIDI, SIDI; With Cylinder Deactivation, SIDI; Without Cylinder Deactivation, SIDI; with i-ELOOP Technology Package | SIDI |
| Transmissions | Automatic (S6), Manual 6-spd | Automatic (S10), Manual 6-spd |
| Drivetrains | 4-Wheel Drive, Front-Wheel Drive | All-Wheel Drive, Rear-Wheel Drive |
| Fuel types | Regular | Premium |
| EPA class | Midsize Cars | Midsize Cars |
| Years covered | 2015–2026 | 2020–2026 |
| Configurations on record | 97 | 52 |
Source: EPA fuel economy records via fueleconomy.gov. Best-case values across all recorded configurations for each model.
3 vs CT5: common questions
Which is better on gas, the Mazda 3 or the Cadillac CT5?
The Mazda 3 is the more efficient of the two: it reaches 33 mpg combined versus 27 mpg for the Cadillac CT5, a 6 mpg advantage and costs about $950 less per year to fuel.
Which costs less to run per year?
By EPA estimates at 15,000 miles a year, the Mazda 3 runs about $1,850 a year in fuel at its most efficient configuration, versus about $2,800 for the Cadillac CT5 — a difference of roughly $950 per year.
What engines do the 3 and CT5 offer?
Mazda 3: SIDI, SIDI; With Cylinder Deactivation, SIDI; Without Cylinder Deactivation, SIDI; with i-ELOOP Technology Package. Cadillac CT5: SIDI.
Are they in the same vehicle class?
Yes — the EPA classifies both the Mazda 3 and the Cadillac CT5 as Midsize Cars, so they compete directly.
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Comparison id: mazda-3-vs-cadillac-ct5