I have some questions about wheels. Hope you guys can help me out.

1. What is the benefits of having alloy wheels? Chrome Wheels? Titanium Wheels?
2. What does a bigger wheel do to Camry Hybrid? Does it increase FE? Handling?
3. What kind of wheels would you recommend if you were to do an upgrade to 18"?
4. What is a good performance tires that you recommend for Camry Hybrid for handling, low noisy and comfort?

Thanks in advance.