The purpose of this survey is to establish the grading index of the ecological vehicle (gasoline-methane) with indicator light. (D.L. Pat. No. 265674)

The indicator light can be fixed to gasoline-methane cars, in two versions:
-Horizontal Linear in the front
-Little Star in the back

Useful to indicate if the car is running on methane (when the indicator light is on), or on gasoline (when the indicator light is off), this also produces effective gasoline-methane cars advertising and reducing the diesel cars, it will indirectly make the air of cleaner cities.