Hourly rate in Kill games?

[guidoguru]

Should the way you calculate your hourly rate be different for a kill game than a game without a kill? My regular B&M game is 3/6 with a 6/12 kill. Whenever i record my sessions in this game into my spreadsheet i always use $6 as the BB, but i make a note that it is a kill game. For example, last night i bought in for 2 racks, played for 3.5 hours, and cashed out with $320. My spreadsheet tells me i netted 20 BB's, and was making 5.71 BB/hr. Should i change the BB to $12 so that i would net 10 BB's and make 2.86 BB/hr? Or is it enough to simply make a note that it was a kill game and that my hourly rate will typically be higher than in a 3/6 without a kill?