If you want to stay with am American car I'd second the Buick Century or LeSabre. Both will get at least 30 mpg with conservative driving. They are quiet but the ride is definitely on the floaty side. Probably the highest quality GM cars out there for the age. You may be able to get a pretty good deal since their initial depreciation is high but it levels off. You might find a nice 04-06 coming off a lease that would be very affordable.
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