He used an Ernie Ball on "Mountain Time" tonight in Springfield, but used the blue Les Paul for "John Henry," and it wasn't in an alternate tuning (at least I don't think so). Sounded like he played it in E.
By the way, Joe, if you're still reading this thread, unbelievable show tonight. I was serious too, please come to Hartford (just not the Webster Theater - no use playing in an old porno movie theater). The Bushnell is beautiful, as is the Warner in Torrington and the Palace in Waterbury.
"Another song, another mile." - The Black Crowes