My 92 Bronco 5.8L with 4" lift, 33's and 4.10s gets 12 MPGs and has about 200 HP. 
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---------- Post added at 03:07 PM ---------- Previous post was at 03:02 PM ----------
If they were remotely close in stock performance, put $400 into each for a SCT X4 with custom tunes and it is no longer remotely close.
Buy a Prius if you're that worried about economy.

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---------- Post added at 03:07 PM ---------- Previous post was at 03:02 PM ----------
Lol. 5.3 is a dog? I'm pretty sure the 5.3's run right with an Ecoboost unloaded.. Ecoboost may have more power but that's about it. It still only gets marginally better fuel economy and sounds like a civic.
If they were remotely close in stock performance, put $400 into each for a SCT X4 with custom tunes and it is no longer remotely close.
Buy a Prius if you're that worried about economy.