Interesting Results On First MPG Test Using A New Additive

Several days ago wrote that I was going to try a fuel additive something I just don't do but did and what follows is what has been learned.

The parameters are these. Numbers rounded off to tenths except gas and that's to the penny.
28.5 is the average MPG that will be used for my car and that is being a bit generous. That drops at 80mph but it will not be driven at that speed any time soon. I drove no different than I always do and will drive the same as always.

Results of the first fill after additive was added
Started with a full tank with additive added to it. 28.2 was the mpg for that tank.

424 miles 12.3 gallons = 34.7 mpg
At 28.5 mpg that =14.9 gallons. a difference of 2.6 gallons
At $3.60 a gallon that = $9.36
It cost $1.09 for the additive which equals a savings on this tank of gas of $8.27
This equals a 23% increase overall.

I got as much damn gas in there as I could and am surpised to say the least. It's understood these results do not mean a whole hell of a lot not until there are more results but never the less this could prove to be very interesting.