I was reluctant to use it at first, I have asked Gull many questions regarding where to get Gull Force 10 and how long the 'Brewtrolium' promotion will run for. The only answer they would give me is that it exactly the same as Force 10. I finally found out from my local server that the promotion will run for 6 weeks and that apparently it is identical to Force 10 because once the by-product is turned into ethanol it doesn't matter what the source was. So essentially it is exactly the same gas, I have been using it for the past two weeks after I found out this info and it runs exactly like Force 10 does. Long story short, it's the same gas because once the ethanol is formed the by-product no longer exists and can have no effect what so ever on the quality.