Cadillac CT4 vs Lexus IS
The Cadillac CT4 is the more efficient of the two: it reaches 27 mpg combined versus 26 mpg for the Lexus IS, a 1 mpg advantage and costs about $100 less per year to fuel.
Across 5 measured categories, the Cadillac CT4 leads in 5. Figures are EPA test data, not manufacturer claims.
Head-to-head specifications
| Metric | Cadillac CT4 | Lexus IS |
|---|---|---|
| Best combined MPG | 27 mpg ✓ | 26 mpg |
| Best city MPG | 23 mpg ✓ | 22 mpg |
| Best highway MPG | 34 mpg ✓ | 32 mpg |
| Lowest annual fuel costEPA estimate at 15,000 miles per year | $2,800 ✓ | $2,900 |
| Lowest CO2 output | 327 g/mi ✓ | 345 g/mi |
| Engines offered | SIDI | SIDI & PFI, SIDI |
| Transmissions | Automatic (S8), Manual 6-spd, Automatic (S10) | Automatic (S6), Automatic (S8) |
| Drivetrains | All-Wheel Drive, Rear-Wheel Drive | All-Wheel Drive, Rear-Wheel Drive |
| Fuel types | Premium | Premium |
| EPA class | Compact Cars | Compact Cars |
| Years covered | 2020–2026 | 2015–2026 |
| Configurations on record | 52 | 52 |
Source: EPA fuel economy records via fueleconomy.gov. Best-case values across all recorded configurations for each model.
CT4 vs IS: common questions
Which is better on gas, the Cadillac CT4 or the Lexus IS?
The Cadillac CT4 is the more efficient of the two: it reaches 27 mpg combined versus 26 mpg for the Lexus IS, a 1 mpg advantage and costs about $100 less per year to fuel.
Which costs less to run per year?
By EPA estimates at 15,000 miles a year, the Cadillac CT4 runs about $2,800 a year in fuel at its most efficient configuration, versus about $2,900 for the Lexus IS — a difference of roughly $100 per year.
What engines do the CT4 and IS offer?
Cadillac CT4: SIDI. Lexus IS: SIDI & PFI, SIDI.
Are they in the same vehicle class?
Yes — the EPA classifies both the Cadillac CT4 and the Lexus IS as Compact Cars, so they compete directly.
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Comparison id: cadillac-ct4-vs-lexus-is