*2.1. Description of Experimental Data.*

To have homogenized linguistic variables, the defined set of linguistic values can all be expressed in monetary units. Data at state level were obtained from the ENCEVI survey performed in 2018 by INEGI [4]. Figures 1–3 show the averages by state for transport, fuel used in cooking and electricity expenses.

**Figure 1.** Average monthly transport expenditure per household in pesos, by State. Source ENCEVI, INEGI.

**Figure 2.** Average bimonthly electricity expenditure per household in pesos, by State. In Mexico,

payment for domestic electric service is made every two months. Source ENCEVI, INEGI.

**Figure 3.** Average monthly cooking fuel expenditure per household in pesos, by State. Source ENCEVI, INEGI.

It is important to mention that these variables, taken from the literature, are coupled to the variables of the survey. Within the survey the expense for household appliances or heating is not included, this is included in the total expenditure of electricity.

In this case, the ENCEVI survey does not consider electricity as a cooking fuel. In Mexico, very few households use electric stoves. The selected linguistic variables show similar behaviour in all states. This could be a problem for the precision of the method. The value-bands need to be adjusted to refine the results (Energy Access) value-range. This procedure will also depend on the experience of the expert in charge of designing the process.
