I tend to dislike coded feeding systems, or even having to roll to feed, personally. It's a nice idea, but it tends to ignore outside factors which are pretty huge, and force 'A, B, or C feeding situations' on people.
My current most-played vamp is a Mekhet in GMC/B&S. If I want to "mug" feed, why am I even rolling? All I have to do is obfuscate, walk up to somebody on the street, obfuscate them and feed. If I need to feed more still, do it again. Strength + Brawl (or Streetwise/whatever) doesn't really reflect that accurately, imo. Even Strength + Brawl + Obfu doesn't seem to.
Or if I want to 'seduction' feed, my character has a whopping pool of Presence1+Persuason0. Yet, I can use Auspex1 to go 'who here is most likely to give me what I want', and that should direct me straight to somebody who is drunk enough or horny enough to be an easy meal and not care what I'm rolling. Or I can just drag out a Coterie-mate/ghoul and have them majesty/dominate food.
Or I can just grab an animal somewhere, be it manually or via a coterie-mate with animalism. Do I really need to roll survival when I can obfuscate and walk right up to an animal and snatch it?
There are so many ways for vampires to feed that a coded feeding system seems a little silly. A system just to monitor /amount/ of blood might be interesting, though. Yes, the neighborhood with two clubs in it probably has more available blood than the park.