This bubble chart visualizes 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 scales with highway MPG and its color distinguishes the manufacturer. Built with D3 v7, the SVG visualization uses `scaleLinear` for axes and bubble size, `scaleOrdinal` with `interpolateTurbo` for color mapping, and `axisBottom`/`axisLeft` for labels. Interactive tooltips appear on mouseover via D3 event handlers, showing the car make. The legend displays MPG values as circle sizes and includes a color-coded list of all makes.