update?
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You were getting 17mph on the highway?! I only get 12.5 on the highway and 9.5/10 around town! Granted I have a heavy takeoff at the light changes but that shouldn't be that great of a difference on the highway between my '03 and your '04 they are both the 2 valve 5.4 engines. What other mods have you done to get the improved mpg? Improved hp doesn't necessarily give you better mpg's?to me...its worth it...although you may spend the $400 upfront...throughout the year you will save more is youre wanting gas mileage...i have superchips and love it...my mpg's increased from 17 to about 23-24 mpg's depending on how i drive...and other modifications...you will feel a difference in shift and take off pending your settings...i know i saved money withing the 1st 2 months of having mine
update?