2025 head-to-head · Midsize Car
2025 Audi RS vs Cadillac CT5
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 2025 Cadillac CT5 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 $2,576 for the 2025 Audi RS (23 MPG). That's roughly $297 a year, or about $1,486 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
- Audi RS
- Cadillac CT5
Side by side
| Audi RS | Cadillac CT5 | |
|---|---|---|
| $2,576 | Your annual fuel cost | $2,279 |
| 23 MPG | Combined efficiency | 26 MPG |
| 20 MPG | City | 23 MPG |
| 29 MPG | Highway | 32 MPG |
| 87 cu ft | Passenger volume | 99 cu ft |
| 8 cu ft | Cargo volume | 11 cu ft |
| 385 g/mi | Tailpipe CO₂ (g/mi) | 341 g/mi |
| 5/10 | EPA fuel economy score | 5/10 |
| 5/10 | EPA greenhouse gas score | 5/10 |
| Gas | Powertrain | Gas |
| Premium gasoline | Fuel | Premium gasoline |
| 2.5L 5-cyl turbo | Engine / motor | 2.0L 4-cyl turbo |
| 7-speed dual-clutch | Transmission | 10-speed automatic |
| AWD | 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.
Audi RS vs Cadillac CT5 across model years
- Audi RS
- Cadillac CT5
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
Per EPA interior volume figures, the Cadillac CT5 has more passenger space (99 vs. 87 cu ft); the Cadillac CT5 has more cargo space (11 vs. 8 cu ft).
Among 42 2025 midsize cars, the Audi RS ranks 36th and the Cadillac CT5 32nd for lowest fuel cost.
Frequently asked questions
Which is more fuel-efficient, the 2025 Audi RS or the 2025 Cadillac CT5?
Measured by cost to drive, the Cadillac CT5. The Audi RS is rated 23 MPG combined and the Cadillac CT5 26 MPG (EPA, most efficient configuration of each).
How much does it cost to fuel the 2025 Audi RS vs. the Cadillac CT5 per year?
At 15,000 miles a year with $3.95/gal premium gas, about $2,576 for the Audi RS and $2,279 for the Cadillac CT5.
Which has more cargo space?
The Cadillac CT5, with 11 cu ft of luggage volume versus 8 cu ft (EPA interior volume index).
Audi RS vs Cadillac CT5 in other years
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