I wasn't comparing a Mustang to a Vette, I was comparing a Mustang to a Caprice. The fact is the 5.0 Mustang was horrible for police work--too small, not enough utility, and it didn't even have a performance advantage over the Caprice which was still available then, unless you made substantial modifications to it. GM was stupid to stop making the Caprice, no doubt there.
FYI the Hemi-powered 300C and Magnum don't have a Chrysler tranny. They get a Mercedes 5-speed auto. Chrysler was smart enough to NOT risk putting their famously crappy transmission in their top-of-the-line cars. Models without the Hemi get the regular Chrysler transmission.
Police Impalas in no way get anywhere near 30 MPG in police work. The best I've heard of them getting in day-to-day use is about 14 MPG and since the CV is usually good for 11-12 MPG there's little to choose between them. The CV has the advantage of better durability, its tires last longer, it's just a better car overall. The Impala's only saving grace is it's a bit cheaper to initially buy which is a deciding factor a lot of the time. Well it also has more comfortable seats than the 1998-current CV has. I could almost call the Impala comfortable while spending long periods in the CV usually leaves me with sore knees. Nonetheless, I still have yet to see a front-drive car that is actually good for police use.
J_A_B