Yes that's wasted fuel in a diesel as well. They do it with drag rigs so that maximum fuel is already there once the turbo spools up and it can make ridiculous amounts of power. Drag racers aren't concerned about fuel economy, so they just pour the fuel in on a diesel rig, as there's no negative performance impact in doing so.
Having worked with structural steels, the torsional forces on that truck on the right are incredible, I hate to think what would happen if that frame failed under such load.
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