Economy Picking Help!

I am new to economy picking, and need a little help getting my head around the concept, i have been just strait alternate picking for a long time now. I am wondering, what would be the best way to economy pick this phrase? right now i have it like this, (U's are up strokes, D's are down strokes).
         
          U      D    U      D      D     U      U      D     U      U      D     U       U
e (----18---16--15----------16---15----------------15-----------------------------)
B (----------------------18----------------18---16----------18---16---15----------)
G (--------------------------------------------------------------------------------17---)
D (--------------------------------------------------------------------------------------)

I also have no idea what the most effiecient way to pick out this phrase would be.
     
       U   U     D    U    D     U   D     U     D    U    U       D        D   U     D      U     D     U        U       D
e (-13-------13--15--18--15--13--------15--13-----------------13----------------------------------------------------)
B (------16----------------------------16-------------16--15b16-------16--13---------16--13/11-------13b15-----)
G (-------------------------------------------------------------------------------------15-----------------12---------------)
D (---------------------------------------------------------------------------------------------------------------------------)

I have it like this...

i would greatly appreciate any help with this, thanks.

Django