The researchers used a method called Thermogravimetric Analysis to study how fuel evaporates in different conditions. They looked at gasoline and diesel fuels with varying thicknesses and temperatures. The results showed that TGA can accurately mimic the factors affecting fuel film evaporation, like heating rate and film thickness. High wall temperatures are needed for fast and sufficient fuel evaporation. The study also found that diesel fuel can fully evaporate at temperatures above 250 degrees Celsius. During rapid evaporation, different components of the fuel mix dissolve and evaporate at different rates, not strictly based on their boiling points.