I have been using a fuel mixture bottle for measuring the amount of 2 stroke oil to add to 5 litres of unleaded for a while now. But today I bought a different type of 2 stroke in a 1 litre bottle that has the amount of ml on the side. I poured 200ml according to the oil bottle into the mixture bottle and had a 50ml difference. I don't know how much of an effect the wrong mixture is going to have on my 2 stroke equipment especially at this sort of discrepancy but will definitely be finding out which one is accurate if either is.
I cant believe that a product meant for mixing fuels can be out that much in the first place.