That may be true BUT you can not, not, compare tread wears between tire companies. They use different methods to come up with their tread wear that is not universal. The only time you can compare tires and tread wear is if they are made by the same company. In all honesty I think for an every day driver the Sumitomos would be a better tire and would probably last longer. 285s on a 10.5" rim is just incorrect and could be unsafe when hitting potholes, etc.
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+1. your new rims will be all effed up if there is too small of a tire on them. it sounds like you are completely opposed to a drag
radial, which is your decision, and your car. I am running 315 Bfgoodrich drags ($275 each) and they are a good tire for everyday
driving. but if you absolutely do not want to go that route, buy the sumitumos, but be warned that you will end up replacing
them sooner than you think.... you get what you pay for.