octane and mpg
Tue, 27 May 2003 15:43:48 -0400
But, if it enables more advance under cruising conditions, it will increase mileage and increased timing advance gives a more efficient burn and better mpg.
>If your A4 is a 1.8t (and maybe even on the NA 2.8) your ECU will detect
>the fact that you are running a higher octane fuel and may change your
>fuel and ignition maps a bit to give you more power which can in turn
>increase fuel consumption, likely nulling out any increase in fuel
>economy you may have attained from going with higher octane fuel.