May I suggest a P71 Crown Vic? Incredibly long lasting, most go far over 200k miles and they drive far, far, better than you think, if you can think outside the current sheep train. Plus with a spot light, black grill, and shitty wheels they scare the hell out of any non gov't paid employee.
You are talking about the secondhand Ford Crown Victoria Police Interceptors, the used Police cars that municipalities auction off when they are replaced. Usually they have about 80,000 to 140,000 miles on them.
They are like regular Crown Vics (see the Mercury ad above) but with heavy duty batteries, frames, transmission coolers, radiators, steel wheels, full suzed sapres and other haevy duty equipment.
They are teriffic value, as the get mid 20s on mpg, are roomy and have a long life, as many are bought in bulk by taxi companies and run for up to 400,000 miles or more.
Decent examples can ber found at about $5000 and up. Go to the archives at Crown Victoria, Grand Marquis, Marauder, and Towncar
to learn more. Check Crown Vic on ebay for dozens of examples.
Like with any car, shrewd selection is all.
Always avoid the ex-Dog (K9) cars, and if possible, regular patrol units (because they tgransported prisoners on the back, and are called "Vomit Comets)
The best bets are the Highway Patrol Units, as they usually didn' transport prisoners, but some of them had long idle run times on the engines which would not show up on the odometer.
The very, very best ones would be the Supervisors cars, Lieutenant or Detective cars, undercover units or ones sold new to other non police agencies like water departments.
Those ones come in civilian colors with civilian wheels, and at first glance look like regular crown vics. But they have the full police heavy duty package (CVPI) on them. They have never been used to transport prisoners, or abused in high speed pursuits or off road, or idled for long periods of time, and don't have black grilles or small hubcaps or spotlights, usually. They are the best ones to get, but hard to find. they are called the SAP cars - "Street Appearance Package" models and the smart money always goes for them.
Starting with the 2008 model year, they (Crown Vics) are no longer sold to retail customers, only to Police, rental and Taxi fleets. If you wanted a 2008 model, you have to buy a Grand Marquis.
The funny ad aside, they make a great deal. If you look carefully, you can buy a b rand new basic one for $18.000 - $19,000 brand new. The basic technology is old, but they are a terriffic value for what you get.
What Shane said about them is true, the traffic will part like the red sea for you, but there is a downside, which is Police harrassment of people who drive old Police cars.
Those people are called "Whackers" by the police, as sometimes would be molesters, police wannabes, and various psychos buy old police cruisers and play pretend police in them. And the real Police HATE that, and really harrass people they think are being Whackers.