I do not know where Saad Hashim ( Toyota salesmen and the national language ) got his information regarding Chinese Filipinos speaking to each other in Pilipino. If they know Chinese, they will speak to each other in Chinese.

Ilocano Filipinos (from Northern Luzon) speak to each other in Ilocano. Tagalog Filipinos (in and around Manila) speak Tagalog. Likewise every other ethnic group in the Philippines (and there are hundreds) uses its own language when speaking to another of the same linguistic group. Almost all Filipinos speak in their own dialect in their homes and villages, unless of course the husband or wife comes from another of the Philippines enumerable indigenous groups, or migrant races, or a person from another ethnic group.

They only speak Pilipino, the national language of the Philippines, when the other person cannot speak their mother tongue (or dialect). Among the educated, English (or its colourful local adaptation, Taglish) will be used to communicate to "other" Filipinos.

I am married to a Filipina. She speaks Tingguian to her family members and those from the highlands of her province, Ilocano to those from her region (Northern Luzon). Tagalog to other Filipinos outside her home region. She speaks to me in English, because I am a "foreigner.