This example displays a scatter plot of automobile fuel efficiency against horsepower, with points colored by country of origin and tooltips showing model names. The visualization uses the Vega-Lite API to construct the chart declaratively, combining `vl.markCircle` with encodings for the quantitative axes and nominal color. Data comes from the UCI Auto MPG dataset loaded via `d3.csv`. The code integrates vega, vega-lite, and vega-lite-api libraries, with additional tooltips from vega-tooltip and custom axis styling from a config object.