2026 head-to-head · Compact Car
2026 Cadillac CT4 vs Lexus IS
MPG, range and what each one really costs you to fuel, from official EPA ratings and recalculated with your own gas and electricity prices.
The 2026 Cadillac CT4 is the cheaper one to run. Driving 15,000 miles a year with $3.95/gal premium gas, it costs about $2,279 a year to fuel (26 MPG), versus $2,693 for the 2026 Lexus IS (22 MPG). That's roughly $414 a year, or about $2,072 over five years.
Your numbers
Change these to match your driving and local prices. Every figure and chart on this page updates.
Fuel cost over 10 years
- Cadillac CT4
- Lexus IS
Side by side
| Cadillac CT4 | Lexus IS | |
|---|---|---|
| $2,279 | Your annual fuel cost | $2,693 |
| 26 MPG | Combined efficiency | 22 MPG |
| 22 MPG | City | 19 MPG |
| 32 MPG | Highway | 27 MPG |
| 90 cu ft | Passenger volume | 90 cu ft |
| 11 cu ft | Cargo volume | 11 cu ft |
| 345 g/mi | Tailpipe CO₂ (g/mi) | 403 g/mi |
| 5/10 | EPA fuel economy score | 4/10 |
| 5/10 | EPA greenhouse gas score | 4/10 |
| Gas | Powertrain | Gas |
| Premium gasoline | Fuel | Premium gasoline |
| 2.0L 4-cyl turbo | Engine / motor | 3.5L 6-cyl |
| 8-speed automatic | Transmission | 8-speed automatic |
| RWD | Drivetrain | RWD |
✓ marks the better value. EPA scores run 1–10 (10 is best). Volumes come from the EPA interior volume index and aren't published for every body style.
Cadillac CT4 vs Lexus IS across model years
- Cadillac CT4
- Lexus IS
Annual fuel cost of the most efficient configuration of each model year, at your prices. Click a point to open that year.
How they differ
Among 21 2026 compact cars, the Cadillac CT4 ranks 16th and the Lexus IS 19th for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2026 Cadillac CT4 or the 2026 Lexus IS?
Measured by cost to drive, the Cadillac CT4. The Cadillac CT4 is rated 26 MPG combined and the Lexus IS 22 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2026 Cadillac CT4 vs. the Lexus IS per year?
At 15,000 miles a year with $3.95/gal premium gas, about $2,279 for the Cadillac CT4 and $2,693 for the Lexus IS.
Cadillac CT4 vs Lexus IS in other years
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