Aspiring Blues Brothers may be able to get old Crown Vics cheap pretty soon — but if you’re at all eco-minded, you may not want to drive them. The iconic and soon-to-be-retired police rides only got 14 m.p.g. in the city, but the Ford Interceptor — set to be their primary replacement when they go out of production — does 20 to 25 percent better.

That’s good news for the planet, but even more compelling for most police departments, it’s also good news for local budgets. Detroit, for instance, could save $2 million a year on fuel costs with a Ford Interceptor fleet, and L.A. County could save $20 million.

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