I wouldn't be scared of the 175-65-15 size. 175-70-14 was an optional size, at least on the coupes, and both 175s get the same load rating.
That being said I'd get the 195s ,my pick in the 175 would be the Yokohama avid ascend, which is $5 cheaper per tire in the 195 size. The 195s also offer more tire options.
If you're expecting 95% highway, if anything I'd be thinking about a larger diameter. If you think the engine is lugging more than you would like then reduce the load with aero mods and lrr tires, rather than making the engine spin faster
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