I was thinking about police chases on my way home today. That's probably not a good idea for me when I'm driving. You know how police have "persuit vehicles"? I want to make an "escape vehicle". First I would need the right car. Something that has good acceleration, excellent handling, and good braking. Brakes can be easily upgraded. I'm thinking something small, with an open sunroof, and all wheel drive. You could throw caltrops out of the open sunroof to puncture the tires of your persuers. To make an auto exhaust smoke screen, you need a hose running to your exhaust manifold. It gets hot, so you just pour oil down the tube, the oil burns, and you pour black smoke out of your exhaust pipe.

More important than what you drive is how you drive. If you are going to do something that may lead to you being chased, such as robbing a bank, learn the police policies on chases. Will they back off if you're putting people in danger? Usually they will. So you need to be a good driver, but PUT AS MANY PEOPLE IN DANGER AS YOU CAN! Drive fast through surface streets, through elementary schools, whatever it takes. You don't want to kill anyone, you just want the cops to say "this is fucked up, let's back off". The smoke screen may help here.

Then you have the problem of the helicopter. The helicopter is your biggest obstical in escaping police. No matter how much smoke you dump out, the helicopter will find you. I racked my brain about this and couldn't find any really good solutions. I guess you could paint your car "road grey", but that's not a sure fire way. You could put LCD screens on the top of your car and lights and cameras under the car to project the image of the road onto the screens, but who has the resources to do this? I guess tunnels would be your best bet. You can't very well leave a car parked in a tunnel to switch with. Perhaps you could get a motorcycle on a walk way or something and then dump the car and hop on the bike, take off your coat, and come out looking like an innocent bystandard. The car would cause a traffic jam and the deception wouldn't last long. Maybe the smoke from the car would obstruct the view of the people behind you while you got on the bike? I don't know. A lot depends on traffic, too.