I've had about 50 Crown Vics as company cars and they all got better gas mileage than my Jeep...
I've got a soft spot for the venerable Crown Victoria. Noble workhorse that she is.
My friend had a 2001 police interceptor in college, with the push bar on the front. It worked well in AZ being all white it looked like the az highway patrol. Everyone got out of our way. They are nice vehicles.