2005 Mercury Grand MarquisFuel Economy & MPG Ratings
Gasoline Large CarsRear-Wheel Drive
City
16
MPG
Highway
23
MPG
Combined
19
MPG
Real-World MPG
Based on 11 owner reports via EPA fueleconomy.gov
22.0MPG average+15.8% vs EPA label
EPA combined: 19 MPG · Owner reported avg: 22.0 MPG
Range: 17–29 MPG
Driving mix: City 41% / Highway 59%
Source: EPA fueleconomy.gov “Your MPG” owner submissions. Real-world results vary by driver behavior, conditions, and equipment.
Owner reported MPG for this vehicle averages 22.0 real world MPG based on 11 owner reports. EPA combined rating is 19 MPG.
Trim Comparison
Automatic 4-spd
Regular
City
16
Hwy
23
Comb
19
Fuel cost: $3,550/yr
| Trim | Engine | City | Hwy | Combined | Fuel Cost/yr |
|---|---|---|---|---|---|
| Automatic 4-spd | Regular | 16 | 23 | 19 | $3,550 |
Annual Fuel Cost
$3,550
Based on gasoline at $3.67/gal, 15,000 miles/year
5-Year Fuel Savings
$-5,750
vs. average new vehicle
EPA Fuel Economy Score: -1/10
GHG Score: -1/10
Environment
- CO₂ Tailpipe Emissions
- 468 g/mile
- Annual Petroleum Consumption
- 15.7 barrels
Specifications
- Engine
- 4.6L 8-cyl
- Transmission
- 4-speed Automatic
- Drivetrain
- RWD
- Body Style
- Sedan
Source: EPA fuel economy data & NHTSA vPIC. Specifications reflect the most common trim configuration.
Engine & Efficiency Details
Source: EPA fueleconomy.gov
- Engine Size
- 4.6L, 8-cylinder
- Fuel Type
- Regular Gasoline
Annual Fuel Cost by State
Prices as of week ending May 18, 2026 · Source: EIA
National AvgEPA default
$4.490/gal$3,545/yr
California
$5.957/gal$4,703/yr
Texas
$3.888/gal$3,069/yr
Florida
$4.136/gal$3,265/yr
New York
$4.522/gal$3,570/yr
Ohio
$4.510/gal$3,561/yr
Washington
$5.591/gal$4,414/yr
Colorado
$4.618/gal$3,646/yr
Minnesota
$4.344/gal$3,429/yr
Massachusetts
$4.448/gal$3,512/yr
| State | Gas Price | Annual Cost | vs. National Avg |
|---|---|---|---|
| National AvgEPA default | $4.490/gal | $3,545/yr | — |
| California | $5.957/gal | $4,703/yrHIGHEST | +$1,158 |
| Texas | $3.888/gal | $3,069/yrLOWEST | $-476 |
| Florida | $4.136/gal | $3,265/yr | $-280 |
| New York | $4.522/gal | $3,570/yr | +$25 |
| Ohio | $4.510/gal | $3,561/yr | +$16 |
| Washington | $5.591/gal | $4,414/yr | +$869 |
| Colorado | $4.618/gal | $3,646/yr | +$101 |
| Minnesota | $4.344/gal | $3,429/yr | $-116 |
| Massachusetts | $4.448/gal | $3,512/yr | $-33 |
Calculated at 15,000 miles/year (EPA standard assumption) using 19 MPG combined. Regular gasoline prices. Actual costs vary.
Related
Mercury Grand Marquis MPG History
See how this model's fuel economy changed by year