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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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#1
Fri, April 23rd, 2010, 05:42 PM
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ford motors are built for low compression/87 octane. the only motors i know that are built for higher compression are euro motors and race motors/crate engines.
research this and see what you find. idk if its too late to re-order or not but shoot him an email and see what happens. g/l
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1999 f150 4x4 - Flowmaster 40 series exhaust - 33" BFG M/T km2's - PHP Gryphon Programmer - RotorPros Slotted rotors - Mag-Hytec Diff Cvr Let's go Wheelin!!! 
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#2
Fri, April 23rd, 2010, 10:14 PM
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I did 0-60 and 1/4 mile time tests with tunes adjusted for premium and never did any better. One thing that some people have been finding from the higher octane is slightly better mileage when they tune for it. On average over here the premium is about $.20 higher. This comes out to a little below 7%. If you can get 7% better mileage then the higher octane will pay for itself. Just something to think about. Personally I would keep a tow tune to make pulling heavier loads easier and more efficient.
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#3
Sat, April 24th, 2010, 12:53 PM
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Thanks for the input. Yea, Jack had mentioned that the gain in gas mileage probably wouldn't be enough to offset the extra cost. Think I'll try to get it changed to an 87 Tow if I can.
Rob
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