DAMN Riders - No rules, Just ride!

I'm currently running Kenda 270's on my XR650L with 18 psi front and back. That seems to be fine for gravel and hardpack but I'm wondering if I should be pressuring up for highway speeds. Is there much danger of rolling the tire off at that pressure? Suggestions greatly appreciated.

You can check the manual for recommended pressures. On my DRZ it is 18f, 22r for on the road. So you aren't doing too bad, I would say.

It'll feel better on the road with more, but it's not unsafe.