If you really really really want to be totally accurate and get the best wear, temperature, etc, for street driving get the load/pressure table for that particular tire (all specs for that tire including brand)that you put on (not just the general size) as all tires are different even if they have the same size because of the load rating, etc. Go weigh your JT as regularly loaded with you in it. Use the table and it will tell you the corretcAny recommendations for tire pressure? just tossed on some 315/70 17's, and wondering what others are running, street pressure.