This visualization displays an interactive scatter plot of vehicle data, mapping miles per gallon against horsepower, with points colored by region of origin and sized according to vehicle weight, along with tooltips revealing car model names. Built using the Vega-Lite API, the code registers vega, vega-lite, and vega-tooltip, then renders a circle mark with quantitative and nominal encodings. Data is loaded asynchronously via `d3.csv` from the UCI Auto MPG dataset hosted on GitHub, and the chart fills the browser window with a custom configuration for axis styling.