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We are all going to be comfortable within our own limits.
Each and every one of our limits is relative...
I can comfortably tune 13BT's within 5% of their max potential with just an EGT gauge.
That's a lot of trial & error + experience.
To me, this is not the ragged edge.
In fact, on a Haltech, this is adjusting "gross" amounts with the PAGE UP / PAGE DOWN keys.
This is initially done on street tuning, and I tell the customer we can get that last few HP's on the dyno - it's just safer that way.
This is also about using tools and using them efficiently.
If you don't know how to use the tools properly, it just usually leads to disaster.
What you can do is learn how to do this, if you're willing to make an effort to do so.
Like TTT said, you're just wasting gas (which could become a factor since analysts are predicting $5/gallon for gasoline sometime this year) and killing spark plugs.
So to me, it's not really a matter of "rate of return" - I see it as having the confidence to be able to use all the tools at your disposal to attain the best result for your investment.
-Ted
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