normal 87. Its not recommended to use 91 or 89.
but its just like any other vehicle. you can do what my dad tried awahile ago.
He filled up his car with 91 and found out it saves him $50 a month with gas because it got him about 1-3 MPG better ON THE HWY, not the stop and go streets.
But 87 will be fine for you 06.
my 01 didnt change when i put in 91.
I doubt the 06 will change dramatically.
I think putting in 89 or 91 is wasting your time.
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