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In my garden in Adelaide, 2" is very rare night, 3-4" is common and worse is not uncommon. Looking at a defocused star at high power one can see the very fast wave moving across the disk, from what I read it's from higher altitude currents, I wonder if it's heat coming off the city mixing with higher wind currents.
However in Arkaroola I can generally bang out 20-30hr images with average 1.6", worst case 1.8" especially if the target is a bit lower. The good nights are usually 1.2"-1.5", really good is 1.0"-1.2", though that is pretty rare especially away from zenith. I usually throw away any L frame > 2", color I'll keep up to 2.4" ish if I have too since it has less impact to the result.
EB
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