Hi i have one question. I just put in my order for a DARK BLUE PEARL 07 E350 XLT 6.0L 5-SPD Van. I want to get the best mileage i can. So, will i take a big hit on the 4.10 LSlip i have on order, over the 3.55 option with out LSlip? How much more RPM can i save and MPG is it going to make 1-2-3-0? I have 6-8 days to make a change. Thanks for any help. Doug
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