2009 Cadillac DTS MPG & Specs — Real-World vs EPA, All Trims
Every trim takes regular — no premium needed.
Is the 2009 Cadillac DTS good on gas?
At up to 18 MPG combined, the 2009 Cadillac DTS is worse than average for a Large Cars — that class averages about 20.3 MPG across 2,605 EPA-tested versions, so it's on the thirsty side for its size.
Real-world MPG vs the EPA number
The EPA figures above come from a standardized dynamometer test, not the open road — real-world MPG typically runs a bit lower depending on your driving, climate and terrain. That's true of every car on this site, old or new.
At today's AAA national average price — $3.80/gal for regular gas as of 2026-07-05 — the most efficient trim runs about $3,167/year (roughly $264/month, about $21.11 per 100 miles) at the EPA's assumed 15,000 miles/year, using an estimated 833 gallons a year. We don't estimate a cost-per-fill since exact tank size isn't in the public EPA dataset, but the per-100-mile figure scales to any tank. Current national average gas prices →
2009 Cadillac DTS trims & fuel economy
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr (today's price) |
|---|---|---|---|
| 4.6L 8-cyl, Automatic 4-spd, FWD | REGULAR | 18 | $3,167 |
| 4.6L 8-cyl, Automatic 4-spd, FWD | REGULAR | 18 | $3,167 |
2009 Cadillac DTS specs
What the EPA test-car listings record for this model year — every combination sold is a row in the trims table above.
| Engine options | 4.6L 8-cyl |
| Transmission | Automatic 4-spd |
| Drive type | FWD |
| EPA body class | Large Cars |
| Fuel | Regular |
Other years of the Cadillac DTS
Similar cars (Large Cars)
Cars that take premium · Cheapest cars to fuel · Where fuel grade depends on the trim · Fuel guides
2 trim(s) · EPA FuelEconomy.gov data retrieved 2026-07-24 · fuel prices AAA national average as of 2026-07-05.