Getting this '93 FWB, what kind of mpg to expect?

With Jim's, aka The Fleetwood Guy, great help in checking the car out and supplying a few fine odds and ends it needs, this '93 will be delivered Sunday or Monday. Its got 128K on it. Curious on what kind of mpg's they should get in proper tune and what mods might increase mpg. We are out in a rural area and the commute is 25 miles one way mostly at highway speeds.

Thanks.

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