tire pressure

This is a spinoff from a post by eXwiLL94...

My civic's user manual recommends a tire pressure (29/30, I think) for the stock tires. When I went from 185/65/14 to 195/55/15 with higher-rated (both speed rating and max pressure rating) tires, I asked the place I bought 'em, tire manufacturer and my honda service guy what tire pressure I should use for everyday driving, and none of the answered agreed.

How do you decide what pressure to run in your larger-than-stock tires?

I find that 34 psi in mine gives good handling characteristics and mileage, and I found that through trial and error.