The attainment of a consistent temperature throughout the bed and the efficient transfer of heat are essential objectives in fluidizing solids. This is accomplished by employing a fluid medium that suspends particles within it. The present investigation selected high-ash Indian coal and press mud as the biomass materials under consideration, specifically focusing on the Indian environment. The combination of gasification of coal and press mud exhibit a synergistic phenomenon, hence enhancing the overall efficiency and productivity of the process. To attain the specific size range necessary for suspension in a fluid condition, the raw materials underwent grinding. The press mud samples were combined with coal at weight ratios of 10, 20, and 40%. The gasification process was effectively executed within the temperature range of 850–960 °C, without encountering any operational difficulties. The study investigated the carbon conversion efficiency (CCE), the calorific value of the product gas (CV), cold gas efficiency (CGE), and syngas generation per kilogram of feed for each mix scenario. The experimental results indicate that the output of syngas per unit mass of feedstock increases with the elevation of gasification temperature, ranging from 850 to 960 °C, across all biomass blends. Furthermore, the study revealed that the levels of CCE, CV, CGE, and CO-H2 in the product gas increase with higher reactor temperatures and greater proportions of mixed biomass.