This bubble chart shows the correlation between average horsepower, torque, and highway MPG across multiple car makes. Each circle’s position encodes horsepower (x-axis) and torque (y-axis), while its radius and color represent highway MPG and car make, respectively. Built with D3 v7, the visualization uses `d3.csv` to load data, `d3.scaleLinear` and `d3.scaleOrdinal` for encoding, and interactive tooltips with mouseover events. Circle size and color are mapped via legends, and rendering uses SVG with hover animations for emphasis.