That value has been estimated by government regulators based on 15,000 miles driven per year, using regular gasoline, and a split of 55% city driving and 45% highway driving. The estimated fuel costs for the 1989 Mercury Grand Marquis is $3,500 per year. □ What is the Average Yearly Fuel Cost for a 1989 Mercury Grand Marquis? The combined average MPG for the 1989 Mercury Grand Marquis is 18 miles per gallon. A 1989 Mercury Grand Marquis gets up to 15 miles per gallon in the city, and 22 miles per gallon on the highway. □ How Many Miles per Gallon (MPG) Does a 1989 Mercury Grand Marquis Get?įirst off, the most commonly asked question. Whether you are considering a purchase of the car, or just wanting to find out how economical and environmentally friendly (or un-friendly) your 1989 Mercury Grand Marquis is, we have the information you need. The 1989 Mercury Grand Marquis runs on regular gasoline and is in the Large Cars car class. ![]() On this page, you will find a complete guide to the miles per gallon and fuel efficiency data for the 1989 Mercury Grand Marquis. 1989 Mercury Grand Marquis MPG and Fuel Economy
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