I've run -3.5 on my car with Continental scrubs, but the outer edge of the front tires still wear way too quickly. I suspect something around -4.0 might work better.
At -3.5 your street tires will get killed after a few thousand miles on the highway.
In terms of adjusting camber, there are plenty of gauges readily available on the market for a few hundred bucks (Intercomp, Long Acre, etc.) There are apps for it as well. Just make sure you are on a level surface.
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