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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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#6
Sun, January 23rd, 2011, 10:06 AM
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MPG?
Well the Gryphon has been installed for a month now. I just made a 600+ mile trip and was wondering why...
My hand calculations for mpg were 15.75 mpg. The Gryphon display for average mpg showed 20.6 mpg as I was rolling into the driveway. That seems to be a HUGE discrepency. I have the 87 tow tune loaded, tire size and diff. ratio are correctly loaded. Why such a huge difference? 
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