Tires... Proxes 4 or Falken Ziex 912?

I’m thinking of going Toyo Proxes 4 now.

A question that I’m sure is gonna have the answer “2% isnt that big of a deal…”

225/45/18 is the correct sizing, but costs $30/tire more!

I can get 225/40/18 but lose 2% on the speedo, showing me going 2% faster than I really am.

Do I get the 225/40/18? At the moment, my bald ass stock tires are showing almost 4 MPH quicker on the speedo due to the tread wear. So, 2% at full tread… who cares, right? It changes through the entire life of the tire anyways…

Did I just answer my own question? 225/40/18 over 225/45/18, am I right?