Mercury Grand Marquis
What it costs to keep fuelled
$2,667a year, fuel only
The 2007 Mercury Grand Marquis is EPA-rated at 18 MPG combined (15 city / 23 highway). Over 15,000 miles a year that is about 833 gallons, $2667 a year in fuel, or $0.178 per mile at $3.20/gal.
Across its full 1984–2007 run it averages 18.1 MPG, improving by 2.5 MPG over 24 model years.
The band is how far one gallon carries it: 18 of the 60 MPG this scale runs to. The square tick is the large cars average, 21.6.
- Fuel, per year
- $2,667 at 15,000 mi
- Per mile
- $0.178
- Per kilometre
- $0.110
- Gallons burned/yr
- 833
1 mile = 1.609344 km · fuel at $3.20/gal, fixed JUL 2026
Test figure — not a road resultSOURCE·US EPA fuel-economy test data·FUEL ASSUMED AT $3.20/GAL FROM JUL 2026·REVIEWED JUL 2026
How this is worked out
- Start from the EPA combined figure for the model year — a laboratory test cycle run to a fixed procedure, not a road result. Where a year sold several engines or drivetrains, the trims are averaged and the trim count is printed beside the row so you can see how much averaging is behind it.
- Fix a pump price. This site keeps one reference price, $3.20 a US gallon, fixed JUL 2026 and printed next to every dollar figure it produces. It is an assumption with a date on it, not a quote — put your own price in.
- Fix an annual distance. Every annual figure on this site uses 15,000 miles a year, roughly the US average. A cost per year with no stated distance is not a number, it is a mood.
- Divide distance by economy for gallons, multiply by price for the year's fuel, divide price by economy for one mile. The per-kilometre line is that last figure divided by 1.609344 — the same money, in the unit most of the world drives in.
- Stop there. No depreciation, no tyres, no insurance, no servicing. This is the fuel line of the ledger and it is labelled as one; depreciation usually dwarfs everything on it.
gallons/yr = miles/yr ÷ MPG fuel $/yr = gallons/yr × $/gal cost $/mi = $/gal ÷ MPG cost $/km = cost $/mi ÷ 1.609344
The full method, the licence note, and what a test figure cannot tell you →
Re-run the ledger at another pump price
Every line above rests on one pump price. Here is the same entry re-costed at six others, because the price is the part that changes while the test sheet stays put.
| Fuel price | Per mile | 10,000 mi/yr | 15,000 mi/yr | 20,000 mi/yr |
|---|---|---|---|---|
| $2.50/gal | $0.139 | $1389 | $2083 | $2778 |
| $3.00/gal | $0.167 | $1667 | $2500 | $3333 |
| $3.20/gal | $0.178 | $1778 | $2667 | $3556 |
| $3.50/gal | $0.194 | $1944 | $2917 | $3889 |
| $4.00/gal | $0.222 | $2222 | $3333 | $4444 |
| $4.50/gal | $0.250 | $2500 | $3750 | $5000 |
| $5.00/gal | $0.278 | $2778 | $4167 | $5556 |
SOURCE·US EPA fuel-economy test data·FUEL ASSUMED AT $3.20/GAL FROM JUL 2026·REVIEWED JUL 2026
The whole service history, sheet by sheet
24 model years on file. Read down the combined column: a nameplate that got heavier shows it here long before any brochure admits it.
| Year | Combined | City | Highway | EPA fuel cost/yr | CO₂ g/mi | Trims |
|---|---|---|---|---|---|---|
| 2007 | 18 MPG | 15 | 23 | $3450 | 494 | 2 |
| 2006 | 18 MPG | 15 | 23 | $3450 | 494 | 2 |
| 2005 | 19 MPG | 16 | 23 | $3300 | 468 | 1 |
| 2004 | 18 MPG | 15 | 23 | $3450 | 494 | 1 |
| 2003 | 18 MPG | 16 | 23 | $3450 | 494 | 1 |
| 2002 | 18 MPG | 15 | 23 | $3450 | 494 | 1 |
| 2001 | 18 MPG | 16 | 23 | $3450 | 494 | 1 |
| 2000 | 18 MPG | 16 | 23 | $3450 | 494 | 1 |
| 1999 | 18 MPG | 15 | 22 | $3450 | 494 | 1 |
| 1998 | 18 MPG | 15 | 22 | $3450 | 494 | 1 |
| 1997 | 18 MPG | 15 | 23 | $3450 | 494 | 1 |
| 1996 | 18 MPG | 15 | 23 | $3450 | 494 | 1 |
| 1995 | 18 MPG | 15 | 23 | $3450 | 494 | 1 |
| 1994 | 18 MPG | 16 | 23 | $3450 | 494 | 1 |
| 1993 | 19 MPG | 16 | 24 | $3300 | 468 | 1 |
| 1992 | 19.5 MPG | 16.5 | 23.5 | $3200 | 456 | 2 |
| 1991 | 18 MPG | 15 | 22 | $3450 | 494 | 1 |
| 1990 | 18 MPG | 15 | 22 | $3450 | 494 | 1 |
| 1989 | 18 MPG | 15 | 22 | $3450 | 494 | 1 |
| 1988 | 18 MPG | 15 | 22 | $3450 | 494 | 1 |
| 1987 | 19 MPG | 16 | 24 | $3300 | 468 | 1 |
| 1986 | 19 MPG | 16 | 24 | $3300 | 468 | 1 |
| 1985 | 17 MPG | 14 | 22 | $3650 | 523 | 1 |
| 1984 | 15.5 MPG | 13.5 | 19.5 | $4025 | 574 | 2 |
Where a model year offered several engines or drivetrains, the figure is the average across all EPA-tested trims that year — the trim count is shown so you can see how much averaging is involved.
SOURCE·US EPA fuel-economy test data·FUEL ASSUMED AT $3.20/GAL FROM JUL 2026·REVIEWED JUL 2026
Marked against the rest of the large cars bay
Among the 149 large cars models tracked here, the Mercury Grand Marquis ranks 97 on current figures, against a class average of 21.6 MPG — the square tick on the gauge above.
Closest more-efficient alternatives in the same class: Cadillac DeVille (18.5), BMW 550i Gran Turismo (19), BMW 750i xDrive (19), BMW 750Li (19), BMW 750Li xDrive (19).
Tailpipe CO₂ is rated at 494 grams per mile, which works out to roughly 7.4 tonnes a year at 15,000 miles.
Questions asked across the counter
What MPG does the Mercury Grand Marquis get?
The 2007 Mercury Grand Marquis is rated at 18 MPG combined by the EPA — 15 city and 23 highway. Across all 24 model years in the database it averages 18.1 MPG, ranging from 15 to 20 depending on year and trim.
How much does a Mercury Grand Marquis cost in fuel per year?
At 18 MPG and 15,000 miles a year, it burns about 833 gallons — roughly $2667 a year with fuel at $3.20 a gallon, or $0.178 per mile. The EPA's own published annual figure for the 2007 model is $3450.
Has the Mercury Grand Marquis become more efficient over time?
Yes. It has gone from 15.5 MPG in 1984 to 18 in 2007 — an improvement of 2.5 MPG, or 16% across 24 model years.
Is the Mercury Grand Marquis efficient for its class?
It ranks 97 of 149 in the Large Cars class on current figures, against a class average of 21.6 MPG. That is 3.6 worse than typical for the class.
Pull another logbook off the same shelf
Same class, nearest economy first — the ones a buyer is genuinely choosing between.
SOURCE·US EPA fuel-economy test data·FUEL ASSUMED AT $3.20/GAL FROM JUL 2026·REVIEWED JUL 2026
Cost per mile, per kilometre and per year are computed at a reference price of $3.20 a gallon over 15,000 miles, fixed JUL 2026 — set your own pump price. Estimates based on official test figures and average fuel prices. Real-world consumption varies with driving style, load, terrain and maintenance.
