I realize one gets an experience bonus when in a party, but I have a few questions I'm hoping can be answered.

1. How much extra is the party bonus?
2. Do you need to be in a party of 4 to receive the bonus?
3. If not, how much is the bonus for a party of 2 and 3?
4. Do pets receive the bonus?
5. If I am in a party, but my party members are not in the instance with me (due to d/c or some other reason) do I still get the exp bonus?
6. How do experience elixirs work in relation to the party bonus? As in which is applied first, and which stacks on top?

If any of you could answer even one of these I would be grateful.

Thank you!