Why the worse gas mileage than p38 or DI
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That year P38 and DI's both have GEMS engine management systems, DII's have a Bosch management system. Seems to me that the "cleaner" they make engines the worse the fuel mileage gets. I have no hard data but it sure seemed that way on the succession of Ford pickups I've had over the years, the engines got smaller, the engine management got newer and the mileage got worse (I don't have an Ecoboost, I stopped liking the Ford styling about 2003 and haven't had one since I got rid of mine in 2010)
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