And if you require resources like tutorials specifically for car modeling and you are not finding them for MoI but you do have them for other programs then it sounds like the other programs are a better fit for what you're trying to do than MoI is currently.

Car modeling is definitely possible in MoI, you can find many examples in the gallery: http://moi3d.com/gallery/ but it's an advanced area of modeling.

It is kind of on the border between organic shaping and mechanical shaping.

Overall if you don't have a lot of experience it is probably easier to do with poly modeling.

- Michael