When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
It really depends on how you drive....
Why don't you try 36 at the rears and 32 at the fronts and start from there? By the way, if you're going to drive at sustained high speeds this is probably a tad low and you should probably try 2 or 3 PSI higher on both ends.