This visualization displays the correlation between average horsepower, torque, and highway MPG across various car makes. Each bubble’s position maps horsepower on the x-axis and torque on the y-axis, while its size and color encode fuel efficiency via a linear scale and a sequential viridis color scale. The code uses d3.csv to load data, d3.scaleLinear for axes and radii, and d3.scaleSequential for coloring. Interactive tooltips appear on mouseover, and a gradient legend clarifies the MPG color mapping.