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Is your suspension modified? Looking at your garage I don't see it listed, and the pictures look like your car is at the stock ride height. If you have a noticeable camber angle with stock suspension then you have some serious issues that probably need corrected before worrying about anything else. Have you had a shop check the alignment to get some #'s?
90% of the time, excessive wear is due to improper toe alignment or slop in the suspension (ball joints, bushings, etc. that cause toe issues while driving). The extra rolling resistance from a -2 degree camber angle is probably insignificant in terms of fuel economy, and it's not likely to cause wear issues if you rotate your tires frequently.
I wouldn't trust the average alignment tech to figure out how much toe is required to balance out the effects of the camber angle on steering force.
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