Power Tuner for Gas engines

I run an SCT tuner with tunes from 5 star tuning. With the V-10 it made a significant improvement in towing. Mine came with 3 different tunes, towing, perf. and economy. And can be had in any octane rating. I have the 3 tunes in the 89 octane. When towing now it is much more relaxed because the trans shifts better and it holds O/D longer and raises the shift points and line pressure. I can also change any parameter i want to tailor it to my specific needs. It also adds 15HP in the towing mode. I gained .7 mpg towing too. You have to understand how a tuner works to use them properly. The generic tuners won't do much for you. But when you get a custom tuner tailored to your specific vehicle it works great.