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My comments were only towards gas engines, diesels work better with forced induction.
On gas motor even if you kept A/F the same if would still use more gas ,unless you could change gearing or something and FI needs richer mixture with gas to stop heat .Generally A/F goes needs about 0.5-1.0 richer so NA loaded might be 13.0-13.5 to 1 and boosted 12.5 to 1
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