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The 3.8 is a good engine. You can expect 30mpg on the highway. I think are are a lot of variables to consider before putting a number on the mpg. Such as, is it tuned up properly include de-carboning and fuel injectors clean, driving habits, outdoor temperature, proper air inflation, tires filled with air or nitrogen, fuel used to name a few aspects, there are many more to consider. Yes, many variables, biggest being how heavy your right foot is. If driven like a police cruiser is behind you, expect 17-18 MPG city, and approx 28-30 MPG highway. Higher speeds have a small effect on highway mileage, but you can drop city mileage to 13 or worse with a heavy foot. Also the higher the milage you get the worse you'll get. My 91 park ave has 276,000 miles and I get about 25 mpg on the highway with a 70mph average.

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Q: What is the mpg on a 1989 Buick Park Avenue?

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20 to 22 city mpg 28 to 30high way

This car will get a maximum of 25 mpg. Assuming you can get 25 mpg you will need 4.4 gallons of fuel. So it is safe to assume 1/2 tank of fuel will get you there and back.

I have a 2000 Buick Park Avenue with a 3.8L series II V6. Currently it has 237,000 miles and runs perfect. I still average 23-26 MPG. I keep up the maintenance and expect 300K unless something catastrophic happens.

According to the official U.S. Government site for MPGs, fueleconomy.gov, the Century was (city/highway) 18/27, Lacrosse 17/25, LeSabre18/27, and Park Avenue 17/26.

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