25 MPG.
When looking into owning a gas mileage is an important factor. The gas mileage for a 1983 Buick Lesabre is 17 miles per gallon city and 24 miles per gallon highway.
Your 2001 LeSabre is rated at 20MPG City/29MPG Highway. I've found this rating to be fairly accurate. I average 20-22MPG when I'm not using the A/C and have measured highway mileage at just a shade under 30MPG. Pretty good for a big car that has a little pep.
Because its a 1988 Buick LeSabre
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I still get 19 in the center city and 27 on the highway with fifteen years on the car. It's surprising how well it does on the highway for such a big, comfortable car.
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