"So you are turning off and removing the battery from your Cell Phone? No?"
Pretty soon, that won't matter either, with MIT developing wireless radios that rely on nothing other than power from the wireless signals floating all around us. That's why I use a Faraday Bag to put my devices in when I am not actively using them.
"And you are worried about your CAR?"
It's still my car. If I want my car's exact speed, location, route and destination being sent to anonymous, random strangers sharing the public roadway with me, I'll be the one who authorizes that data being sent outbound, thank you very much.
"They ALREADY can track you, even with out a warrant. It's called a stakeout and tailing somebody. They can watch you in public, any time they wish, no warrant required."
The major difference here, is that we can track them as well, and they aren't allowed to continue to track you, follow you onto private property without a warrant. They're also not allowed to illegally attach GPS devices to your vehicle, but they're doing that anyway too.
See the problem here?