I find such products do work, I use a product similar to what you are using/describing, it is called Lubecorp Super Gas Plus, this product boosts 87 octane regular gas to 92 (premium) at ratio of 2 mil per litre gas, (1 LITRE TREATS 500 LITRES OF GAS) or (in your American measurments that would be 1 quart treats 138 American gallons, a Canadian gallon is 20% more than an American Gallon, 500 litres is 110 Can gallons) it makes premium gas for 3 cents per litre, up here in Canada there is a $.08 cent per litre charge for premium gas over regular. It stabilizes gas for 2 years, lubricates upper cylinders, pumps, etc. -60C gas line antifreeze, cleans system as one drives.
I first tried it in son's 3.1 1994 Olds cutlass, his highway miles went from 33 to 38 mpg Canadian gallons. His engine quieted down, run effortless. I now use this stuff in everything I drive in gassers, including yard machines. Makes a two stroke husquavana sing, it runs like airplane and engine and uses much less gas now, it also allows me to use littler richer two stroke oil mix too.
I buy SGP in 1 litre bottles for $15.00 per litre in case lots of 8 litres, 1 litre will save me $30.00 in gas savings over and above cost of product. Also, this new ethanol blended gas is hard on pumps etc in my opinion, the lubricy in product like this can save cost of 700.00 on in tank pumps IMO.
You can find Super Gas Plus at
www.lubecorp.com it works and I never fill up any gas tank without using it, I swear by it, I am sure your product is similiar.
It is like what the Lubecorp tech told me after I baraged him with many sceptical questions and comments, "try the product, do the math, either you believe in it or not." I did exactly that, and best for you to do the same ziggy, take mileage with and without your additive, take into consideration cost of product and if it is feasible, even if you break even on cost then the lubricy, cleaning, smoothness, saving on fuel pumps etc and extra power is enough to validate the cost of product.
I also used there straight Octane boost product, raises octane up to 12 points, used for muscle cars, but, tech told me to the one does all product for my purpose, 12 points octane boost makes that engine sing though.
Cyprs