Petron xTra advance RON 93 returns

Hi all,

while nowadays the basic gasoline fuel is RON91, but Petron has returned its RON93 fuel while everyone else don't

what could be the reason for this?

http://www.doe.gov.ph/retail-pump-pr...-december-2013

Petron

but when i was using RON93 of petron before, i did not like it as it lacks acceleration and power, so i used shell FS RON93 back then but now all RON93 is gone