MasterAlex, I pretty much agree with
Lost Cause.
Try not to get too caught up in brand of oil. For economy, weight is most important ... and I'm betting your hybrid already calls for 0W-20. That'll probably be Mobil 1 ... but I'd take another brand in a heartbeat if you could find it reasonably priced (Amsoil, Pennzoil Platinum, etc ...).
Best economy I got in my old Nissan was using Schaeffer synthetic
blend in 5W-30. I think they make a 5W-20 now, too.
If you really want to know too much about oil, try this site (but prepare to be overwhelmed):
http://www.bobistheoilguy.com/forums/ubbthreads.php