Isopropyl. That is the more expensive drygas. Most gas stabilizer are isopropyl. John Captnbr@aol.com wrote: > Is there somthing in a bottle that i can use to keep the fuel in the > rocco good? I drive the rocco about once a month, I would drive it > more but I don't keep insurance on it. About how long does fuel stay > "fresh"? thanks > > Brian 86 16v > 98 Jetta GLX Vr6