As long as ethanol is in your fuel, you are going to have problems. This product may reduce those problems, but you are still going to have problems.
Better to find a fuel supply without ethanol. If you can't find a supply of rthanol-free petrol, it is easy to separate ethanol form contaminated fuel. Simply add 5% by volume distilled water to you contaminated fuel, stir will, then allow to sit for a couple hours. The water and ethanol will combine and settle to the bottom. Pour the purified petrol off the top. This petrol will be a few octane lower than it was with the ethanol, so either start with petrol of higher octane than your engine requires or add a volume of toluene equal to the volume of ethanol removed to the purified petrol to restore octane. As a final treatment I filter the petrol through a chamois to remove any dust or dirt or remaining water.
The water-ethanol mix that settles out of the petrol makes a dandy weed killer that cuts way down on my yard work.
Tdub hates contaminated gasoline. Switching from one to the other is a 8-11kph difference in top speed.