Evans warehouse and tech line are just down the street from me. Pure PG isn't typically suitable for street use. If you lived in a warm climate it would work pretty good. The stuff gets pretty viscous as it cools. It contracts as it cools ..but doesn't freeze in a conventional sense. Anything with water will expand upon freezing. It makes it a pain with use in colder climates where you may have a continuous bypass circuit of substantial flow. It just won't want to push the stuff through the radiator when it's just happy pushing the coolant around the bypass circuit. Many have to modify some things for it to work well.
It's a poorer heat transfer medium then water based coolants. The problem that many have with it ..is dealing with a temp gauge that reads higher then normal. It doesn't boil until 375F. This higher normalized coolant temp presents problems for electric fans that use temp to actuate. They don't "know" that they can realign their setpoints to higher numbers.
To use pure PG you have to absolutely purge all water from your system. They put no anti-corrosion agents in PG.
Some advantages is that you no longer have to have a pressurized cooling system. If you rad cap is on the suction side of the radiator (most aren't), you can use a ZERO pressure cap. The coolant tank is just there for expansion. They do, btw, sell inserts for the lower rad hose so that you can run a no pressure cap. Otherwise, the back-pressure caused by the radiator will push your coolant out the overflow hose.
