I have found that i get the best results between 44 and 50 psi. Mostly because in eoc one will get much better roll out. I only go 55 to 57 mph max on the freeway so i would not think there would be much of a difference between 38 psi to 50 psi at that low speed under power.
I'm going to be a little contrary regarding tire pressures...I've not noticed any significant difference between 32 and 40 psi. 40 is the maximum I've tried, since the tires I was running at the time I tried this gave a max pressure of 35 psi.
FE was the same or slightly improved, wear unchanged, ride much worse and a lot more road noise. Also, in wet weather, the higher pressure tires didn't handle near as well.
__________________ "We are forces of chaos and anarchy. Everything they say we are we are, and we are very proud of ourselves!" -- Jefferson Airplane
Dick Naugle says: 1. Prepare food fresh. 2. Serve customers fast. 3. Keep place clean.
Of course, none of this does any good if you have a slow leak and don't check your pressure.
I thought I checked and inflated a month ago, but maybe it was more and maybe the cool weather is exacerbating my slow leak. For at least a week my steering has been sluggish, my power steering belt has been screaming, and the tires have been squealing around turns like they're misaligned.
Well, I finally noticed my right front tire was visibly very low. 12psi! Left front looked mildly low...16psi! I paid 75 cents to inflate them to 50psi at the first gas station I saw. They're getting replaced soon so I won't worry about the increased leakage rate.
I imagine my fuel economy has suffered. I've been blaming it on my driving.