This bubble chart displays 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. It loads CSV data with d3.csv, scales the axes with d3.scaleLinear, and maps bubble radius through a separate linear scale. Interactive tooltips appear on mouseover, while a legend explains the MPG sizing. The visualization is rendered as SVG with opacity changes on hover, built using D3 v7 selection and join methods.