i tune to e standard, concert pitch (440) and I can't match tom petty's sound........ I am running the bridge pickup on my strat through the Vox AC30TB model on my AD30VT, but that has no bearing on tuning pitch............
It is standard but he uses a capo most of the time. Free fallin uses capo on 3rd fret, last dance with marry jane is on the 2nd I believe...
as far as i know he tunes to standard tuning, i've never had a problem jamming w/ any of his songs and i tune to standard 440
maybe try using a twelve string?