This interactive bubble chart visualizes the correlation between average horsepower, torque, and highway MPG across 31 car makes, using circle size to represent fuel efficiency and color to distinguish brands. Built with D3 v7, it renders as an SVG with smooth transitions, displaying a tooltip on hover that names each make. The chart uses `d3.scaleLinear` for axes and bubble radius, `d3.scaleOrdinal` for color mapping via `d3.interpolateTurbo`, and includes a legend showing MPG values and color-coded brand markers.