I have in the past mixed 10% or so by volume methanol with pump gasoline since we only get 91 octane here. Its worked as I expected at the track right after I do it, but a few hours later on the drive home Ive noticed the AFRs are erratic and much leaner than right after I mixed. Right after I mix its typically .3 leaner and I tune for it in the efi, but it goes to a full point or more erratically after the mixture has sat. Will 10% methanol not stay mixed with gasoline? I just did it again here at my house and drove to eat, it ran perfectly, exactly as I expected. On the way home it ran way too lean. Is methanol heavier than gasoline, would it settle to the bottom partially?
Thanks for any insight!
Thanks for any insight!