I have been trying to find a list or map of NGV stations in Northern Thailand particularly, and cannot find one. Does such a thing exist (in English)?

google Ptt NGV

We have one in Sukhothai

I have seen ngv stations on the way to and at Chiangmai, like ' Tak ' etc.

Maybe this is the reason for the lack of them :-

The cost of producing NGV has stayed at about Bt14 per kilo.

PTT's proposal in 2009 to raise the retail price from Bt8.50 per kilo

to Bt12 was not accepted, ballooning its accumulated loss.