The Jeep Grand Wagoneer does 14 mpg combined (12.4 city, 16.1 highway), which works out to about $2,743 a year in fuel at $3.20 a gallon and 12,000 miles. Engine choice matters more than you'd think: 3L 6-cyl does 17.4 mpg while 5.9L 8-cyl does 11 — a difference of $1,284 a year. Against other V8 cars it sits below the average of 16.1 mpg.
Every Jeep Grand Wagoneer engine, compared
Gas mileage on the Jeep Grand Wagoneer ranges from 17.4 down to 11 depending on which engine sits under the bonnet — a spread of $1,284 a year across 4 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 |
|---|---|---|---|---|
| 3L 6-cyl | 14.8 / 21 | 2022–2026 | $2,207 | |
| 4.2L 6-cyl | 13.8 / 16.5 | 1984–1987 | $2,560 | |
| 6.4L 8-cyl | 13 / 18.3 | 2022–2024 | $2,560 | |
| 5.9L 8-cyl | 10 / 12 | 1984–1991 | $3,491 |
What that actually costs
The Jeep Grand Wagoneer burns a gallon every 14 miles, so 12,000 miles takes about 857 gallons a year. At $3.20 that is what the table below adds up to.
| Measure | Value |
|---|---|
| Cost per mile | $0.229 |
| Fuel per year | $2,743 |
| Fuel over five years | $13,715 |
| Against other V8 cars | +$358 a year |
| EPA's own estimate | $4,940 a year |
City or highway — who is this car for
The Jeep Grand Wagoneer gives up 3.7 mpg the moment you leave the motorway — 16.1 out there against 12.4 in town, a 30% drop worth $712 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 | 12.4 mpg | $3,097 a year if you only drive in town |
| Highway | 16.1 mpg | $2,385 a year if you mostly commute |
| Gap | +3.7 mpg (30%) | Wide — this car dislikes traffic |
How the Grand Wagoneer changed over the years
The Grand Wagoneer peaked in 2026 at 19 mpg (17 city, 24 highway) and was at its thirstiest in 1991 at 11 — 8 mpg apart, or $1,470 a year in fuel between buying one year and the other. The 2026 car does 19. 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 |
|---|---|---|---|---|
| 2026 | 17 / 24 | 1 | $2,021 | |
| 2025 | 14 / 20 | 1 | $2,259 | |
| 2024 | 13.5 / 19 | 2 | $2,400 | |
| 2023 | 13.5 / 19 | 2 | $2,400 | |
| 2022 | 14 / 20 | 2 | $2,400 | |
| 1991 | 10 / 12 | 1 | $3,491 | |
| 1990 | 10 / 12 | 1 | $3,491 | |
| 1989 | 10 / 12 | 1 | $3,491 | |
| 1988 | 10 / 12 | 1 | $3,491 | |
| 1987 | 11.5 / 14.5 | 2 | $2,954 | |
| 1986 | 11.5 / 14.5 | 2 | $2,954 | |
| 1985 | 12 / 13.5 | 2 | $3,072 | |
| 1984 | 12.5 / 14.5 | 2 | $2,844 |
MPG is a number. Dollars per year is the answer.
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How we count
This page rests on 20 EPA ratings of the Jeep Grand Wagoneer — 4 engines across 1984–2026. 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 $4,940. Full method.
Frequently asked questions
What mpg does the Jeep Grand Wagoneer get?
14 mpg combined on average — 12.4 in the city and 16.1 on the highway, per EPA ratings across 1984–2026.
How much does a Jeep Grand Wagoneer cost in fuel per year?
About $2,743 at 12,000 miles and $3.20 a gallon — roughly $13,715 over five years, or 0.229 dollars a mile.
Which Grand Wagoneer engine is the most economical?
The 3L 6-cyl at 17.4 mpg, against 11 for the 5.9L 8-cyl — a difference of about $1,284 a year.
Is the Grand Wagoneer good on fuel compared with similar cars?
Against other V8 cars it sits below the average of 16.1 mpg, computed across 3323 ratings.
Are these real-world Grand Wagoneer figures?
No — they are EPA laboratory ratings, the same ones printed on the window sticker, and EPA's own annual fuel estimate for the Jeep Grand Wagoneer is $4,940 against the $2,743 we compute at 12,000 miles. Expect a little worse in practice: the spread between the 19 and 11 mpg versions of this car is smaller than the spread between two drivers of the same one.
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