I suppose it's not impossible to regularly get 30 MPG in a Crown Vic if you're going easy on the throttle and doing a lot of highway driving. Having had an '00 Impala for a long time, I can say that conserving momentum and avoiding city driving really was key to decent MPG in that car. The EPA says an '03 Crown Vic will get 16 city/23 highway.
Have you driven a Crown Vic before? It's always been my experience in those cars that unless you get a sport suspension (or police suspension,) they are very floaty and don't handle very well. Comfortable to drive, but in my mind, less safe, because I've always been of the school of thought that says that it is better to have a more nimble vehicle and avoid the accident in the first place instead of driving a bigger vehicle.
Personally, if I wanted another big sedan and wanted to go cheap, I'd definitely go with a FWD platform like the GM "W" body 3800 V6. The Impalas especially have depreciated a lot, and considering how many are still being used as police cruisers, I think you'll find that the cost of purchasing and maintenance is in the same ballpark as the Crown Vic.
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