guy from buffalo/rochester ny here.
bought my g8 brand new in 09. changed the all seasons to winter blizzaks and that thing was an absolute tank. I was getting through areas that suv's were having trouble. the car is 50/50 weight with good traction control logic.
all that said, the clearance is **** and the paint is ****. So i'd really recommend a beater if you can swing it. Your Australian made car really doesn't like the effect of the snow. But if that's not a concern, overall she handles really well with snow tires. never tried all seasons.
2009.5 G8GT Premium OnyxRed Interior
corsa catback, vararam intake, cortex tune
custom audio, sharksfin, HIDs, LED Fogs, 20" MRR GT1's, Kayhan headunit