Somewhere between 32 & 36 will work fine & I'm sure is the in line with what was originally recommended. Check your tires cold.....before you drive on them.
Higher pressures are going to cause your ride quality to suffer. Lower pressures are dangerous because the tire can overheat and fail. Underinflated tires will also contribute to reduced fuel economy and shorted tire life.
The max pressure is listed on the sidewall, but the only time you would want to approach using that kind of pressure is if you were running high speed, at or over your vehicles weight capacity, and during hot weather.
Check your tires pressures often, they all typically leak a little. You also need to keep an eye on them when cold weather hits, this can reduce the pressure 10%.
For motorcycle tires I like to see a 10% increase between a cold and hot tire based on the type of riding I am doing at that time. You get a little feel for this after a while. Let's say I am running a big, heavy, adventure bike loaded down with gear and I am making time on a hot summer day on the interstate @ 80+MPH - I may start with 42 - if I check it after a while I will be looking for 46-47...If the pressure is higher than that I am running it too low and letting it heat up too much. If the pressure is 43-45, I am running it too high and I might back it down a pound or two for better grip and ride.