questions about the z

i am a high school student about to get a car, i was planning on a couple of cars but i need some answers about the datsun z's,

How many miles per gallon can they get?

Which would be the most powerful,(if z's are powerful) to buy?

Would they be able to drift, i know that they are a front engine, rear wheel drive car so basically they could, but i mean do they have a stiff enough chassis and etc.

Are aftermaket parts easy or hard to find?

if i wanted to do all around types of racing, like drift, drag, and circuit, would this car be a good choice both in power and in control.

I know parts for the Z's aren't that hard to find but usually you can order them online or through certain magazines. http://www.zcarparts.com/ has a lot of parts for the old and new z's, and you might find some of your answers there. also, www.zcar.com has some info