Impact of biodiesel blends on specific fuel consumption: A meta-analysis

Abstract

Abstract The increasing number of vehicles causes the use of fuels from crude oil to increase causing increase emissions, diseases in humans, and depletion of the ozone layer. One innovation that has been developed to reduce fuel consumption is biodiesel. The purpose of this study is to re-analyze the impact of biodiesel on fuel efficiency in terms of the percentage of vegetable oils and additives, loadings, and engine speeds. The type of research used is meta-analysis. The articles collected used experimental methods. The choice of experimental method was carried out to compare control variables and experimental variables. The control variable in question was testing specific fuel consumption on 100% petroleum diesel, while the experimental class in question was testing specific fuel consumption on biodiesel blends. Moderator variables were biodiesel blends, engine speeds, and loadings. The analysis process was carried out using R studio. The data entered to produce a forest plot in which there were a value interval and standard error for each study and its conclusions also helped in the calculation of heterogeneity and publication bias. The results showed that data in this study met the assumption of heterogeneity. Data in this study was free from bias publication. There was a significant influence of biodiesel blends on specific fuel consumption because the confidence interval range did not cross zero. All p values > 0.05 so that each moderating variable showed no difference.