Stars SNGs: to single or multi-table and its effect on EV

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Hi everybody:

So I set up a stars account so that I could let my gf play low limits. I normally play 1/2 and 5/10 6max, but after I transferred her some loot I had 7 buyins for the $5 SNGs.

Being a NL SNG noob I've no idea on what games have better EV: 1- , 2- , or now 3-table SNGs.

FWIW I play mostly 2-table and have about 30 buyins now. <font color="red"> I am wondering if I'm giving up EV by not playing the 1-table games????? </font>

Any quick advice will be appreciated.