It's all about how you care for your car man. I put nitrous on my car back in June and have been thru 16 bottles since then. It currently has 116,xxx+ miles, and I checked the compression two weeks ago and this is what they read...

#1---175psi
#2---174psi
#3---175psi
#4---175psi
#5---175psi
#6---176psi


1999 Cougar V6 MTX SVT UIM/LIM/65mm TB, I/H/E, Fidanza/SPEC III/Torsen, Koni/GC's, 19" Icon wheels w/ Pirelli rubber, NX Wet Kit