If I have 2 i phones on separate accounts with different numbers but share the same email addess, do they share data usage?
No, they do not use the same data. 2 seperate accounts and 2 seperate phones means 2 seperate data packages. If you are using the same Apple ID though you will get the iMessages and App store purchases mixed up. I recommend creating 2 seperate Apple IDs for 2 seperate iPhones.
