Huh? I don't know who you guys are talking to but not many officers I know (from Hamilton, OPP and Niagara) prefer the Impala over the CV. It's not as fast, it's smaller, the brake fade is a safety issue and it's not as reliable. Who does like it? The senior guys, because it's more comfortable to "relax" in. Oh, and it is MUCH better in the smow...That one I'll give it credit for.
One vivid example of this is a chase that our service had with a Dodge Neon this spring. It started in the city (Hamilton), hit the QEW and was called off by the OPP (they joined in and took the wrong car's tires out with a spike belt) as they hit Toronto. The Neon was OUTRUNNING the Impalas. The only guys that could keep up were in the CVs. The Impalas crap out at 182 km/h not matter how hard you stand on that gas pedal. The OPPs that I know who do highway patrol much prefer the CV. Going from 0 to 140km/h is much faster with that 4.6.
We don't need speed and good brakes often, but when we do we REALLY need it!