I found on the predator U7136 they have 89 octane tunes,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,for 300, magnum ect

U7136 Stock Vehicle Tunes:

93 Octane Performance Tune: Designed to add maximum power and torque using premium 93 octane fuel
91 Octane Performance Tune: Designed to add maximum power and ...

IS there an 89 octane tune available?

2006 Durango 5.7 hemi

u7137, updated yesterday with rev.12

Hi -

Just got a predator for my 2006 Dodge Durango with 5.7 Hemi.
My truck manual says 89 octane recommended, 87 ok, but not to run 91.

I understand that my truck engine is lower compression hemi, doesn't need the 91 octane.

We have three main gasolines here.
1. 87 octane
2. 89 octane with 10 ...