[INFRNL]

I would have replied earlier but been busy and tired.

This is what I recommend and have per Bill.
Stock
High idle (I use it periodically and my pref)
40 tow for heavy tow
80dd can use for light to moderate towing
100perf has differ shift points
120/140 race.

The thing about Bill's standard tunes is that the pedal is like stock or 2barrel carb but if you get into it, it's like a 4barrel and really wakes it up or gives you the power you need.

I imagine diff between 2 close tunes is the power will come on stronger with higher HP compared to lesser HP tune. 15hp is nothing you will probably feel.

Since you are not out for much maybe you should go with something like this. Keep in mind you do not have to do all 6 tunes either.

Stock
40 tow
65 or 80dd
80 or 100 performance.

I find that dd is good for in town and perf is better for hwy. I do not notice any difference in mpg between 80dd and 100perf. Race tunes are for fun. Hope this helps without confusing you any.