I was not worried over the difference in the experience only seeing if it had something to do with game mechanics, such as type of companion you use. Since distance may not be the issue than it maybe perhaps my not tagging mobs or perhaps damaging some of them. As my main concern is healing, I know there are times I feel I have not damaged some of the mobs. Again thank you for your responses, they are most helpful.

Thanik you for all your replies. After reviewing the repsonses I feel that most likely it is due to me being farther away from her while she does damage and I heal. I tend to stand back because I am range damage and as not to draw aggro. We always log out at the same place and log in at same time. The distance from each other is most like the reason for the experience difference, thank you all for your answers, it is most appreciated.

I do not know if this has been addressed or not. My sister, who is playing a sith marauder and I play solely together. We did play our first 17 levels seperate and I think when we got together she was about 17k or so of experience ahead of me. We have done basically all the same quests, including mobs, only exception is our class story. Now she has just made level 36 and I am 125k experience behind her at 35. I am wondering if it is 1. Due to the fact I heal more than do damage. OR 2. Is it the companions we use she uses a healing companion and I use Khem who is melee. Am wondering if he is taking more of my experience than her companion does. This has probably been answered somewhere and am sorry if this is a redundant question. I have seen in previous games that healers need to do damage to get credit while questing and wondered if the same pertained to SWTOR. Any help you can shed on this would be greatly appreciated and thank you for your time.