I still don't believe it. Like I said earlier, modern cars burn well above 98% of all hydrocarbons in their fuel. Even if you could burn the last 2%, the amount of gain you would see in MPG is on the order of 2%. Also, if the amount of acetone is so small to prevent damage to any fuel systems, why would it have any profound effect on the properties of the gasoline? I mean, we are talking about 1 acetone part to every 1000 gasoline parts.