This interactive scatter plot explores automobile fuel efficiency and performance using the UCI Machine Learning Repository's Auto MPG dataset. It displays miles per gallon against horsepower, with circles sized by vehicle weight, colored by country of origin, and offering tooltips for car names. Built with the Vega-Lite API for D3, the visualization leverages `vl.markCircle`, `vl.x().fieldQ()`, and `vl.y().fieldQ()` to encode these dimensions. The code loads data via `d3.csv`, applies a custom configuration for readable axes and fonts, and renders an SVG that fills the browser window.