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| 2004 to 2008 F-150 and Mark-LT 4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs. |
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#11
Sat, March 21st, 2009, 10:48 PM
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Sounds great...about 1.5MPG increase WITH the 15-20MPH increase. Can't complain about that. Anytime you can go faster AND use less fuel is impressive.
I did the mod this evening, but won't drive the truck until the morning. My Gryphon is shipping out Monday, hopefully, from PHP and will be installed the day it arrives. 
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Threaded Mode