chevron super with 93% octane
definitley diesel its a much more effecient engine and surprisingly burns much cleaner than gasoline especially in performance if you put 5grand into a diesel truck your lookin at close to 30 mpgs or...
i use Mobile 93 in my 95 ls 400
ducaty
I have a V6 2003 ,the dealer recomend regular(87 octane).
hard to say sounds more like a matter of personal taste than an absolute fact different people expect different things from their engines