The V2 program cost about $500 million - adjusting for Nazi Germany's smaller economy, it took just a barely smaller fraction of their industrial output than the Manhattan project did for the US. Each individual rocket cost more than a Me-262, a cutting-edge jet fighter (~100,000 RM vs 87,400 RM). The program used up one third of Germany's fuel alcohol production, each rocket requiring thirty tonnes of potatoes to distil the methanol - and due to a lack of explosives, some had warheads filled with concrete instead. When it was clear their conventional forces were being overwhelmed, the Nazis poured even more resources into it, diverting them from fighter and tank production just to crank out a few more wunderwaffen.

This is the vaunted 'fascist efficiency'.