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Annual fuel utilization efficiency

measure of thermal efficiency

Pronunciation
/ˈænjuəl ˈfjuəl ˌjudəˌlaɪˈzeɪʃən əˈfɪʃənsi/
/ˈanjʊəl fjuːəl juːtɪlʌɪˈzeɪʃən ɪˈfɪʃənsi/