This paper investigates the future revenues that Calis local govern- ment will receive from the tax on ga- soline. ARIMA models are used to fo- recast sales of the different type of gasoline sold in the municipality and these tax revenues. The forecasted tax revenues are used to demonstra- te that de Local Government will be able to contribute to the construction of a Massive Transportation System, as it was prearranged in the CON- PES 3166 document.