[TooMuchGlass]

I have a 2008 Infiniti EX35 with dunlop tires on it. The tire sidewall says the max is 51 psi (it also says something about 40 psi in really small type but I think it has something to do with the bead sealer). That helpful little sticker on the inside of my door says I should inflate to 33. I took the car to a place that agreed to fill up my tire for free, cause I had one low (the tires take nitrogen. While I'm not convinced nitrogen is necessary, I'm not confident enough in that yet to just fill them up with good ole' atmosphere.) and the guy went on and on about how it would be a terrible idea to fill the tires up above 38. (I thought nitrogen was supposed to help with that. . . )
Anyway, I've read the posts in the corral about nitrogen- I'm not trying to end up there! I'm asking about tire pressure. I'm no expert when it comes to cars, but I do know that riding my bicycle sucks when I have 70 psi instead of 120. Doesn't my car feel the same?