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I installed an AirAid Throttle Body Spacer on my 04 F250 with a V10 and I did notice an improvement in the mileage. But one day I was using the cruise control and when I tapped the brake to shut it off it did not. That was a little suprise. But after shutting off the engine and restarting it was ok until the next time I used it. I assume the Cruise contol cable is to tight as the throttle body is moved out about an inch. Has anyone else come accoss this and is there any adjustments that can be made, I have not asked the dealer. I have removed it for now as I enjoy using the cruise, but with gas prices the way they are I am willing to try again.