The Jaguar XJ6 does 17.3 mpg combined (14.9 city, 20.8 highway), which works out to about $2,220 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 3.6L 6-cyl does 18.5 mpg while 4.2L 6-cyl does 15 — a difference of $484 a year. Against other V6 cars it sits below the average of 19.9 mpg.
Every Jaguar XJ6 engine, compared
Gas mileage on the Jaguar XJ6 ranges from 18.5 down to 15 depending on which engine sits under the bonnet — a spread of $484 a year across 3 versions of the same car. Picking the right one often saves more fuel than picking a different car altogether. Yearly cost assumes 12,000 miles at $3.20 a gallon.
| Engine | Combined | City / Highway | Years | Fuel per year |
|---|---|---|---|---|
| 3.6L 6-cyl | 15.5 / 22.5 | 1988–1989 | $2,076 | |
| 4L 6-cyl | 15 / 21.3 | 1990–1997 | $2,182 | |
| 4.2L 6-cyl | 14 / 17 | 1986–1987 | $2,560 |
What that actually costs
The Jaguar XJ6 burns a gallon every 17.3 miles, so 12,000 miles takes about 694 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.185 |
| Fuel per year | $2,220 |
| Fuel over five years | $11,100 |
| Against other V6 cars | +$290 a year |
| EPA's own estimate | $4,317 a year |
City or highway — who is this car for
The Jaguar XJ6 gives up 5.9 mpg the moment you leave the motorway — 20.8 out there against 14.9 in town, a 40% drop worth $731 a year. A wide gap punishes stop-and-start traffic; a narrow one means the car doesn't care where you drive it.
| Measure | Value | Reading |
|---|---|---|
| City | 14.9 mpg | $2,577 a year if you only drive in town |
| Highway | 20.8 mpg | $1,846 a year if you mostly commute |
| Gap | +5.9 mpg (40%) | Wide — this car dislikes traffic |
How the XJ6 changed over the years
The XJ6 peaked in 1988 at 19 mpg (16 city, 23 highway) and was at its thirstiest in 1987 at 15 — 4 mpg apart, or $539 a year in fuel between buying one year and the other. The 1997 car does 18. Jumps usually mark a new generation or a new engine; dips often mean a heavier body or added all-wheel drive.
| Model year | Combined | City / Highway | Engines offered | Fuel per year |
|---|---|---|---|---|
| 1997 | 15 / 22 | 1 | $2,133 | |
| 1996 | 15 / 22 | 1 | $2,133 | |
| 1995 | 15 / 22 | 1 | $2,133 | |
| 1994 | 15 / 22 | 1 | $2,133 | |
| 1993 | 15 / 22 | 1 | $2,133 | |
| 1992 | 15 / 20 | 1 | $2,259 | |
| 1991 | 15 / 20 | 1 | $2,259 | |
| 1990 | 15 / 20 | 1 | $2,259 | |
| 1989 | 15 / 22 | 1 | $2,133 | |
| 1988 | 16 / 23 | 1 | $2,021 | |
| 1987 | 14 / 17 | 1 | $2,560 | |
| 1986 | 14 / 17 | 1 | $2,560 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 12 EPA ratings of the Jaguar XJ6 — 3 engines across 1986–1997. 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 $4,317. Full method.
Frequently asked questions
What mpg does the Jaguar XJ6 get?
17.3 mpg combined on average — 14.9 in the city and 20.8 on the highway, per EPA ratings across 1986–1997.
How much does a Jaguar XJ6 cost in fuel per year?
About $2,220 at 12,000 miles and $3.20 a gallon — roughly $11,100 over five years, or 0.185 dollars a mile.
Which XJ6 engine is the most economical?
The 3.6L 6-cyl at 18.5 mpg, against 15 for the 4.2L 6-cyl — a difference of about $484 a year.
Is the XJ6 good on fuel compared with similar cars?
Against other V6 cars it sits below the average of 19.9 mpg, computed across 4940 ratings.
Are these real-world XJ6 figures?
No — they are EPA laboratory ratings, the same ones printed on the window sticker, and EPA's own annual fuel estimate for the Jaguar XJ6 is $4,317 against the $2,220 we compute at 12,000 miles. Expect a little worse in practice: the spread between the 19 and 15 mpg versions of this car is smaller than the spread between two drivers of the same one.
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