This interactive D3.js v7 chart visualizes the 2026 French tax mileage allowance scale for cars, plotting deductible amounts against professional distance for five fiscal horsepower classes. Users can toggle between thermal and 100% electric vehicle rates, with dashed lines marking the 5,000 and 20,000 km band limits where slopes change. The SVG rendering uses d3.line, d3.scaleLinear, and d3.axis, with data loaded from a CSV file. Tooltips display exact values on hover, while transitions animate path updates when switching engine types.