1986 Mercury Marquis (3.8L 6-cyl) MPG & Specs
Quick answer
The 1986 Mercury Marquis gets an EPA-estimated 17/21 MPG (city/highway) and 18 MPG combined, with an estimated $3,400/year fuel cost and 493.722 g/mi CO₂. Engine: 3.8 L 6-cyl.
The 1986 Mercury Marquis with the 3.8-liter 6-cylinder regular gasoline engine returns an EPA-estimated 17 MPG in the city and 21 MPG on the highway, for a combined 18 MPG. This page summarizes the official EPA fuel-economy and emissions data for this configuration.
| Engine | 3.8 L 6-cyl |
| Transmission | Automatic 3-spd |
| Drive | Rear-Wheel Drive |
| Fuel type | Regular Gasoline |
| Vehicle class | Midsize Cars |
| MPG — city | 17 |
| MPG — highway | 21 |
| MPG — combined | 18 |
| Annual fuel cost* | $3,400 |
| CO₂ tailpipe | 493.722 g/mi |
| EPA GHG score | — |
How efficient is it?
With a combined 18 MPG, the 1986 Mercury Marquis sits in the low range for fuel economy. That is roughly 29% thirstier than the typical Midsize Cars of its era (26 MPG class average) — expect higher fuel bills than class-average alternatives.
Fuel economy and running costs
At about $3,400 per year in fuel (EPA estimate, 15,000 mi/yr), fuel is a major part of the cost of owning the 1986 Mercury Marquis. Over five years that is roughly $17,000 at today's prices — before insurance, maintenance, and depreciation.
Emissions
The 1986 Mercury Marquis emits approximately 493.722 grams of CO₂ per mile at the tailpipe. Lower emissions generally track higher fuel economy.
How to read these numbers
EPA figures come from standardized laboratory test cycles and are the same estimates shown on the vehicle's window sticker. Your real-world mileage depends on driving style, conditions, fuel grade, and maintenance. Use combined MPG and annual fuel cost to compare vehicles fairly.