Ken,
I've seen posts on chips programmed to use 87 octane and 91 octane. Just curious about setting one up for 89 octane. Cost over 87 isn't near as much here as 91. Would there be much difference in performance (hp/Torq) or is this a waste of time

 

With the average mileage increase you're usually breaking even with a premium fuel chip so why not get the extra power. There isn't much power to be felt going from 87 to 89 on a truck that size.