I think that the alcohol content might be to high and is not mixing as I thought it would because of the methanol content of the denatured alcohol, so try mixing it with more gas/oil mixture I would say add about 20% more gasoline mixed with oil at the ratio that you used on the first mixture, that should bring your alcohol content to about 15% and make it more miscible, perhaps the oil that you are using doesn't help very much in stablishing a tertiary system of solubility. well try it and see what happens and please let me know your results of your mixture.