Against 283 other V6 cars rated 2023–2025, the XT6 sits right on their 21.1 mpg average. Averaged over the years each was sold, the most economical engine since 2020, the 2L 4-cyl (2021–2025), does 23 mpg and the thirstiest, the 3.6L 6-cyl (2020–2025), 20.8: $176 a year apart.
Every Cadillac XT6 engine, compared
Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 2L 4-cyl | 21 / 26 | 2021–2025 | $1,670 | |
| 3.6L 6-cyl | 18 / 25 | 2020–2025 | $1,846 |
What that actually costs
Against its rivals in the same model years, the Toyota RAV4 gets 36.7 mpg, the Jeep Wrangler 18.8 mpg and the Mazda CX-5 27.3 mpg, next to 22 mpg for the 2025 XT6.
| Measure | Value |
|---|---|
| Cost per mile (2025) | $0.145 |
| Fuel per year | $1,745 |
| Fuel over five years | $8,725 |
| Against other V6 cars, 2023–2025 | −$75 a year |
| EPA's own estimate | $3,145 a year |
City or highway — who is this car for
The 2025 Cadillac XT6 gives up 6 mpg in town: 26 on the highway against 20 in the city, $443 a year if every mile were city driving.
| Measure | Value | Reading |
|---|---|---|
| City (2025) | 20 mpg | $1,920 a year if you only drive in town |
| Highway | 26 mpg | $1,477 a year if you mostly commute |
| Gap | +6 mpg (30%) | Wide — this car dislikes traffic |
How the XT6 changed over the years
The XT6 peaked in 2025 at 22 mpg (20 city, 26 highway) and was at its thirstiest in 2020 at 20 — 2 mpg apart, or $175 a year in fuel between buying one year and the other.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 2025 | 20 / 26 | 2 | $1,745 | |
| 2024 | 19.5 / 25.5 | 2 | $1,745 | |
| 2023 | 19.5 / 25.5 | 2 | $1,745 | |
| 2022 | 19.5 / 25.5 | 2 | $1,745 | |
| 2021 | 19.5 / 25.5 | 2 | $1,745 | |
| 2020 | 17 / 24 | 1 | $1,920 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 11 EPA ratings of the Cadillac XT6 — 2 engines across 2020–2025. The mileage is EPA's laboratory figure, unchanged; the yearly bill is ours, at 12,000 miles and $3.20 a gallon, against EPA's own estimate of $3,145. Full method.
Frequently asked questions
What mpg does the 2025 Cadillac XT6 get?
22 mpg combined, 20 city and 26 highway, per EPA; its 2 versions that year range from 21 to 23. Across every year since 2020 the XT6 has averaged 21.8 mpg.
Is the 2025 XT6 more efficient than the 2024?
About the same: 22 against 22 mpg combined.
Which XT6 year has the best gas mileage?
The 2025, at 22 mpg combined (20 city, 26 highway), which is also the latest model year we hold.
Does the XT6 get better gas mileage than the Toyota RAV4?
No: 22 mpg for the 2025 XT6 against 36.7 for the 2026 Toyota RAV4, about $699 a year more to run.
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