I like and use the calculator as well, just remember that its a tool and not 100% accurate...real life just has way to many variables (road conditions, elevations, wind, temperature changes, etc, etc). I have been able to consistently beat the "projections" generated, for a variety of reasons. I'm sure you are very aware of this, just didn't want you to justify "mod x" specifically because it will improve your mpg "y" guaranteed.
The biggest take away I have from using the calculator is DRIVE SLOWER. Everybody knows this, but seeing it laid out in that format really helped me, and it maximized all of my other mods as well.
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