An antiknock agent is added to gasoline. It reduces engine knocking and increase the fuel's octane rating.
ʌ n WORD_BOUNDARY æ n t ɪ n ɑ k WORD_BOUNDARY eɪ d̠ʒ ə n t WORD_BOUNDARY ɪ z WORD_BOUNDARY æ d ɪ d WORD_BOUNDARY t ə WORD_BOUNDARY ɡ æ s ə l iː n WORD_BOUNDARY ɪ t WORD_BOUNDARY ɹ ɪ d uː s ɪ z WORD_BOUNDARY ɛ n d̠ʒ ɪ n WORD_BOUNDARY n ɑ k ɪ ŋ WORD_BOUNDARY æ n d WORD_BOUNDARY ɪ ŋ k ɹ iː s WORD_BOUNDARY ð ə WORD_BOUNDARY f j uː ə l z WORD_BOUNDARY ɑ k t eɪ n WORD_BOUNDARY ɹ eɪ t ɪ ŋ WORD_BOUNDARY