I used Pri-G for quite some time, about 2 years until Sta-Bil marine formula came out. PRI-G does a great job of stabilizing fuel for a long time. I run a XR6 150 HP if it matters.
I'm not trying to chang your mind; I just like the marine Sta-Bil because of the cleaning properties of it plus it keeps gas fresh.
Pri-G will help for a cleaner more efficient burn and will help keep your fuel system clean. As far as cleaning up a dirty fuel system I think Sta-Bil has more cleaning properties.
With two stroke oil and gasoline being mixed before combustion in a 2 stroke makes for a not so clean engine compared to a car engine.
Also there is Sea Foam but it is too dang costly. I think as far as an all around stabilizer and fuel system/combustion cleaner you can't beat marine Sta-Bil. If you didn't have to use so much Sea Foam to stabilize fuel, 1oz. to 1ga. gas it wouldn't be a bad choise. JMHO