Quote Originally Posted by JoRoW99 View Post
I agree with the OP, except my MPG loss was greater. OP, are you looking at the DIC or are you actually calculating it? cuz my MPG on the DIC only dropped like 4 mpg highway but dropped like 10 when i calculate it.

Im on the 3.4 with 21* of timing on a top swap and no knock, im going to be going down to a 3.25 next.
Calculating at the pump. Filled full, went all the way down. Did the math. Came out to like 18mpg (mostly city).