8.1 gassers to increase fuel mileage

[Art]

Sometimes I believe that age doesn't make me any smarter. I ACTUALLY tried to increase my fuel efficiency on my 8.1. I bought the K&N cold air intake system and a Superchips programming system.
Well... after a 2300 mile trip to Florida that I have made for 3 years now, I find that these systems have done NOTHING to improve my fuel efficiency. After very careful controlled conditions, I have averaged 7.5 mpg with the stock equipment OR with these two options.
The bottom line is that after much "experimenting" with "power and fuel saving options", I should have left everything as stock. The K&N system increased the noise under throttle so I couldn't hear the radio. The "towing mode" of the Superchip requires premium and the "power difference" was negligible at a higher per mile cost.
In my humble opinion, just save your money and leave well enough alone (especially with gassers). I would hope that, if you tow with a gasser, think TWICE about sinking money into fuel efficiency claims. It may work with diesels but, in my case, not with gassers.