40mpg Possible in a 98 Buick Lesabre 3.8?

[MadisonMPG]

Originally Posted by wagonman76

The Impala might have a sportier final drive ratio like 3.33, which would likely cut into mileage if the 2.84 or 3.06 is sufficient to move the car down the highway.

It's my dad's car, so I won't be doing anything drastic. He likes it getting 26mpg and I like my Geo getting 48mpg. lol