Quote:
Originally Posted by m3chhawk
Don't forget FI almost always includes free flowing exhaust, no catalytic converter, and more efficient intake designs. Couple these with a custom tune and there is much more leading to the efficiency increase than the turbo/boost.
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That is true, but you also have to consider that the tune is where it takes advantage of all of those changes.
And I would bet most are designed to harness that open exhaust/intake design as quickly as possible to build power quickly. In the end I really really really doubt anyone is getting 30+ MPG on any forced induction VQ37.