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You might lose economy if you reduce back pressure. About the only time it would potentially increase economy would be at WOT, as the engine theoretically could gain a % or 2 on the BSFC. The rest of the time it would potentially be a liability.
I would think back pressure would behave similar to EGR and reduce pumping losses at anything other than WOT. And besides, too much scavenging and it would start pulling unburnt air/fuel right out the exhaust.
(That's how it works in my head, at least)
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