Originally Posted by Blake@F.I. Inc.

If you drive with a light foot, you could actually see an increase. I remember seeing a guy on here who was getting 30+ on the HWY at 70-75. Its all gonna depend on how you drive, obviously with the larger injectors and fuel pump, if you are heavy on the throttle you will see a decrease. However like I said above if your driving patterns do not change, you will get an improvement because it takes less input of the throttle to achieve the same thing.. Hope this helps.