Most of the high YS numbers are using 30% nitro.I do not think pressurized is a hassle just more to go wrong.Heck I live 25 miles from YS service center.Lots of us up here use them.At this altitude power is a problem so we are always looking for low weight to power numbers.The Saito 82 really fits the bill.She is lighter then the 72 with a good 20% more power.Mine is on a Extreme Flight Edge and she has not dead sticked ever-and I 3D the crap out of it.As far as sea level numbers if you use 15% fuel it should be close-I am using 20%