This scatter plot visualizes automotive fuel efficiency and performance data from the UCI Auto MPG dataset, showing the relationship between miles per gallon and horsepower while encoding vehicle origin via color and weight via marker size. The visualization is built programmatically using the Vega-Lite API, which constructs a declarative specification that is then rendered through Vega and Vega-Lite JavaScript libraries. Data is loaded asynchronously from a GitHub Gist using the `csv` function from d3.v5, while the Vega Tooltip handler provides interactive hover details displaying each car model's name. The chart auto-fits to the browser window dimensions.