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I have replaced all interior and exterior lighting with LEDs, except turn signals (relay needs a specific bulb resistance to run) and headlights proper.
If all these bulbs were to run simultaneously, with no headlamp bulbs on, this would draw 330 watts. LEDs can do with 1:10 of this.
Also replaced 55 watt H3 foglight bulbs with motorcycle type 35 watt H3 bulbs. Since the fog lamps have dual lens, difference in light spread and reach is rather small.
The fuel savings are too small to count on an open road. But this is not the point. The gain is the decrease of the amp load on wires and relays. The electric system of modern VWs / Audis / Seats / Skodas is very tightly fit together, and, after some years in harsh temp differences from season to season, the wires cook and harden themselves.
If and only if the H7 / H1 headlamp bulbs could also be replaced with LEDs, the fuel saving becomes big enough to count.
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