What is your tire pressure? Right now I am at 35 psi all around but I have a very bad feeling thats way too high. I am using 225/40/18 tires on 7.5" wide wheel. I know stock is only like 29.

Also what pressure are you guys using in the winter for snow tires?

own 215/65/R16 front 34, rear 31.
but on '18 suppose to be more.

i do 32 all around with 245/40/18z

225/40/18. I run 36 front 34 rear. You're just fine on that setting
For more info:
http://maxmods.dyndns.org/index.php?TirePressure