I just received the SCT Excalibur 2 tuner I ordered and payed for three tunes. I received the order today but inside the box there was no description of what the difference was between the three tunes. I would assume that the only difference would be in the octane of the gas I would prefer to use. Is this correct? One each for 87 89 and 92?

 

Power it on your car and goto custom tunes.
in there, there should say a small description of tunes. when i got mine they said

93 / 3.27
93 / 3.90

for 93 octane and 3.27 gears and one for 93 octane and 3.90 gears. yours miht say something similar.