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Specification Sidewall Radius Diameter Circumference Revs/Mile Difference

195/50-15 3.8in 11.3in 22.7in 71.2in 889 0.0%

205/50-15 4.0in 11.5in 23.1in 72.5in 874 1.7%

So my revs per mile will go from 889 to 874 (difference of 1.7%), how much will my speedo be off and will the car rack up miles slower? I wanna know if this is no big deal or maybe I should get the speedo recalibrated for the new tire size? And if so how is that done? Also is there any performance benefit for going to a 205 from 195 or is it miniscule? I am running a set of Kosei K1 wheels (15x7,+38 offset) Thanks for the help.