The symbol and term permit two conventions. If λ is excess-air ratio,$AFR=\lambda AFR_s=.92(14.7)=\mathbf{13.52}$. If equivalence ratio means fuel equivalence φ,$AFR=AFR_s/\phi=14.7/.92=\mathbf{15.98}$. The official key accepts both ranges13.47–13.57 OR15.93–16.03. Both are retained as separate grading alternatives.
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