[max_k20]

1. 235/40/18 and 265/35/18
2. 235/40/18 and 275/35/18

were recommend for me. I was also told I could go 275 in the back but it's more of a tight fit.

OEM I had staggered setup (225/40/18 and 255/35/18) which give -0.24% difference or 2 rev per mile difference.

OEM : -0.24% and 2 rev per mile
Setup 1 : -0.39% or 4 rev per mile
Setup 2 : 0.70% or -5 rev per mile

I was recommended Setup 1 because of the smaller rolling diameter between the 2 and the fact we stay in the negative rolling diameter like the stock tire setup. I am currently waiting on my tire for Setup 1.

In 19 would be the same sizing except tire height which IIRC are -5 over 18. (235/35/19 and 265/30/19).