Crude oil remains the most common fuel source due to a combination of factors. Its abundance and relatively low extraction costs make it readily accessible and affordable. Decades of infrastructure and technology have been built around oil, from extraction and refining to transportation and distribution. While alternative fuels are gaining traction, they lack the existing infrastructure and economies of scale to compete with oil on a large scale. Furthermore, oil is a versatile energy source, used in transportation, power generation, and manufacturing. Replacing oil entirely with alternative fuels would require significant technological advancements and societal adjustments.