does anyone know if many prop shops in the US are trading crude? if so, is it mainly Brent on the IPE or are they trading Nymex mini contracts? The IPE volume looks liquid enough for trading (+100k/day) but how much of that volume is during US hours? and are people basically trading the IPE Brent contract tic-for-tic with Nymex WTI? also, how about nat gas either on the Nymex mini or thru ICE? any info would be appreicated. thanks a plenty!