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Message: <blockquote data-quote="Vaca2097" data-source="post: 1436878" data-attributes="member: 21152">Okay so I picked up an 04 gt to replace my 98 that an idiot plow driver wiped out over the winter. Problem is that the previous owner said he's running it on premium because the owner before him had it tuned. But I don't have the tuner (if it was a canned tune) or any indication that it needs premium. My only hint as to anything being done to the ecu is that the rear 02s were shut off as it doesn't have mil eliminators and it doesn't have rear cats. The only obvious mods are a kn intake, dragon plenum, catless x pipe, and Flowmaster cat back. The rest are visual and suspension. So what is the most cost effective way of figuring out if it's been tuned and needs premium? I do have the torque app if that helps.</blockquote>