Newbie questions about the 2007 Yaris

[urabus]

I'm interested in purchasing a Yaris Hatchback and have a few questions:

1. What's the difference between the 2006 & 2007 model. I'm from Canada btw
2. For the manual transmission owners, when you're traveling at 3,000rpm, what speed are you going at?
3. Again for MT, if you travel at 120km/h, what rev's are you at?
4. What is the suggested oil change interval?
5. Do you know what the invoice price?
6. Why did you pick the 3/5 door over the other?

TIA!