I have been running the 87 octane tune on my 2005 Supercrew Lariat 4X4. It really has helped the shifts and overall performance & I am very pleased. Since I can also tow with this tune, I am still debating trying the 91 tow tune. If you have tried both I would be interested in your findings. Thanks.

 

I "had" one for my 04. I did notice a little increase between the 91 and 87 performance. No mileage increase on either one. I swapped to my EDGE and picked up almost 2 mpg on the Level 3 and 93 octane. I have no intentions of dropping to the level 2.> The power and MPGs are just what the doctor ordered...

 

Just my opinion here :
Spending the $$ on an 87 octane tune was not even an option for me and other than a log splitter and small trailer for lawn tractor, I do not tow.

I've got the SCT xcal2 product with 3 tunes ( 93 perf/tow and 89 perf ). Loaded the 93 octane as soon as it arrived. I would never even consider anything else than the higher octane tune. $5.00 more per tankful for that ear to ear grin when you nail it, need I say more...

I did go with the 89 octane as the 3rd choice, only because I may take another trip to Yellowstone ( have family in Jackson Hole, WY ) and apparently 89 octane is considered premium fuel at the higher elevations ( I live on east coast and we can readily get Sunoco 94 octane Ultra ) , so I'll bring the tuner along and reflash "down" when needed.

 

It sounds like you have the same Superchips as I do (1745). AFAIK the 87 octane tune is NOT tow-safe. The only tune you can tow with is stock or 91 tow-safe. With that being said, the difference between the 87 and the 91 tow tunes is very noticable.

 

If you go to Mike's web site and look up the 1745, he states that both the 87 octane and 91 octane tunes are towing compatable.