where do you get 50% extra power from?
172 = 150 hp
182 = 230
230-150= 80
80/150 = 0.533 = 53%
I'm sure that you can point to 172 which have other than 150 hp and 182's with other then 230, but there's a whole bunch with those numbers. Anyway, the point is, generally the 182 has a higher power to weight ratio than the 172.