2008 Mercury Grand Marquis FFV MPG & Specs — Real-World vs EPA, All Trims
Fuel grade varies by trim — see the breakdown below.
Is the 2008 Mercury Grand Marquis FFV good on gas?
At up to 18 MPG combined, the 2008 Mercury Grand Marquis FFV 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.
For its most efficient trim, the EPA estimates about $3,450 a year in fuel (15,000 miles) — roughly $288 a month.
2008 Mercury Grand Marquis FFV trims & fuel economy
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr (today's price) |
|---|---|---|---|
| 4.6L 8-cyl, Automatic 4-spd, RWD | FLEX-FUEL | 18 | $3,450 |
2008 Mercury Grand Marquis FFV 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 | RWD |
| EPA body class | Large Cars |
| Fuel | Flex-fuel |
Other years of the Mercury Grand Marquis FFV
Similar cars (Large Cars)
Cars that take premium · Cheapest cars to fuel · Where fuel grade depends on the trim · Fuel guides
1 trim(s) · EPA FuelEconomy.gov data retrieved 2026-07-24 · fuel prices AAA national average as of 2026-07-05.