This bubble chart visualizes the correlation between average horsepower, torque, and highway MPG across more than 30 car makes. The size of each bubble encodes fuel efficiency, while the color distinguishes car brands. Built with D3 v7, the visualization renders as SVG and includes interactive tooltips on hover, a legend for bubble size, and uses d3.scaleLinear for the axes and d3.scaleOrdinal for color mapping.