Well, I thought I had found it this morning. Finally got time to check the pressures - 18-20psi all around!! wth??
Anyway, aired them up and off to work. Was a little pressed for time so I just went to 40 even all around; I'll be more picky about specifics later.
So far it seems like not much difference. Which surprised the heck out of me. I'm at 4.0 right now. still, it might have been a bit of improvement, since it was touching on 4.1 a bit; we'll see when I get a few miles on it. And I haven't checked the interstate mileage yet either.
Still, as soon as I saw the pressures I thought EUREKA!
I'm shocked it didn't help more. Maybe I just had a bad-driving morning