whats everyone running for ratios for snow? and in what type of terrain (ie: mountainous, way hilly, rolling hills, flat, city, burbs, interstate, cobblestone, ready rock, "mt.goats find a different route")

i'm running 38:16 with knobbies and alot of decent hills once for more then the second half of my daily commute (i would guess about 8-10 decent hills)

thinking i might go 38:18 once it gets whiter
-pete