I used one skein of Mountain Colors handpainted "Mountain Goat" worsted weight yarn, 55% mohair and 45% wool, and #8 needles. This made a scarf with about a 65" circumference and 5" wide (ribbed). The yarn is absolutely luscious - soft, light, warm, and developing a lovely halo.
I finished it with an applied I-cord edging of Debbie Bliss Alpaca Silk DK, 80% alpaca and 20% silk. This yarn feels lovely but is very delicate. If you knit with the brand-new yarn it's OK, but if you frog it and try to knit with it again, it starts splitting very easily. It's hard to tink and impossible to un-knot. I won't be buying it again.
I haven't given up on Cat Bordhi's Moebius cast-on, but the first Moebius scarf I made used a different method for casting on (you cast on half the stitches and then pick up from the bottom edge for the next half...not sure if I'm explaining that very clearly) and I didn't have the problem of extra twists. Also Bordhi's cast-on, because it is over two cables, is either very tight to knit into or produces a loose center to your Moebius strip. A lot of Bordhi's projects are felted in which case the loose center wouldn't matter.