This bubble chart visualizes the correlation between average horsepower, torque, and highway MPG across 31 car makes. Each circle’s position reflects horsepower and torque, while its size encodes highway MPG and its color distinguishes the car make. Built with D3.js v7, the chart uses d3.scaleLinear, d3.scaleOrdinal, and d3.axisBottom/Left, with SVG rendering. Hovering reveals a tooltip, and a legend displays MPG size values and make colors. Data comes from the bundled bubblechart.csv.