The "chrome" coating on the lugnuts is a joke - also the worst quality of any car I've owned. Lowest bidder junk!
I'm surprised you have the corrosion issue given that you park indoors. One thing I try to do when I drive my car (I also use it rarely in the summer) is a couple of hard stops from higher speed to scrub the braking surface clean. Unfortunately, my rotors are past being able to scrub them back to a totally smooth surface.
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View my fuel log 2014 Mirage ES 1.2 manual: 63.2 mpg (US) ... 26.9 km/L ... 3.7 L/100 km ... 75.9 mpg (Imp)