Quote Originally Posted by Nubraskan View Post
The alky isn't changing the mass of anything, its just changing density. All air that makes it into the engine is seen by the MAF and the mass of air can't change after the MAF without additional air going through the MAF. So whatever amount of air the MAF reads is the amount of fuel needed to match that regardless of whether the density of the air changes later on.
You're correct. Density was the word that I was looking for. Same principle, different word. LOL