I ran 85 PSI in my 11.00x20's, and 135 PSI in the 14x22.5's in the jockey trucks. Suspension seats kick ass.
Once I finally get off my duff and hook up the MPGuino, and the truck is actually street legal (inspection), I'll be more than happy to do some instant economy tests and report back.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"