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If it pings after you tune it then yeah, bump to 89. That shouldn't affect your towing.
Years ago when gas was cheap and I was stupid I ran 89 in my truck for a little bit and I didn't notice any problems towing. Then someone pointed out the stupidity of that and I went back to 87.
Anyone have a super chips programmer for their ranger. i would like to get one and use the 87 performance tune, but I'm concerned it would affect my towing, if I don't use 87octane.