> This is a flexible-fuel engine optimized to burn alcohol—ethanol, butanol, or methanol, or any combination thereof. Alcohol fuels are great for performance, b

> This is a flexible-fuel engine optimized to burn alcohol—ethanol, butanol, or methanol, or any combination thereof. Alcohol fuels are great for performance, but Koenigsegg says their use is also a key part of making the TFG clean, since they generate fewer harmful particulates than gasoline. And with sustainably-sourced fuel, the TFG can be effectively carbon-neutral.