My experience is that 130 does no harm. But 134 is hell on electronics Electric companies have a recording device that they sometimes install. It shows the voltages a period of time. Days I think. We would all be shocked if they did a test in Mexico. Our Dynasty has an EMS. I went into the shop one day and the power in the MH was off. Lights in the shop were OK . I called the CFE and the lineman that came out tried to tell me that 134 was the Mexican standard. I did not buy his fable. He explained that in a tourist area they keep it high because otherwise it is too low on the weekends when the town is packed. He finally adjusted the output on the transformer. It is now at a safe less than 130.
Moisheh