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When i went from 15's to 17's my speedo was off 3 to 3.5 mph off my what i was really going to. And i proved it with a gps thing that we have on the shop and had a cop run his radar on me, TWICE(Friends with his son) So know what your talking about.
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either you got the wrong tire size or your speedo was already off. go use the calculator. there is just no way it can be that much. none, zip, zilch, no chance in hell .
considering if you go from stock 15" tires to the 225/45/17's you will be going SLOWER than what your stock did, .7% slow to be exact. so you'd be going 59.6mph with the speedo reading 60.
if you go from stock 16's to 225/45/17's you will be going .5% faster which is about .3 mph faster when your speedo reads 60.
stock tire sizes are:
15" wheels - 215/60/15
16" wheels - 225/50/16
correct tire size for 17" - 225/45/17