In the US, rationing of gasoline was done to save rubber, not gasoline. There was a shortage of natural rubber and until synthetics, like Buna, could be produced in sufficient quantities gasoline was rationed to limit tire wear. Collection of things like steel and aluminum pots was just a feel good move for the public. It contributed next to nothing to the war effort.
Rationing also led to industry opening company cafeterias and such, that could get around the rationing to some extent. Companies did this because of wage and price controls imposed by the FDR administration on them. These amounted to 'wages in kind' that were used as an incentive to get people hired in a labor shortage market.
It's interesting to note that during WW 2, members of Congress gave themselves "X" cards for gasoline meaning they had unlimited access to that commodity...
Paper and paper products got rationed not because there was a shortage due to production capacity but rather because there was a shortage of loggers who got drafted heavily and resulted in not enough trees being felled to make it from... Later in the war, this was partially made up by using POW's who were paid higher wages as POW's than they got being in the German (or Italian) army...
On the other hand, the federal bureaucracy crippled many businesses by mandating useless regular reports on all aspects of their production. At one point, the government banned all "pleasure driving" and expected local police to enforce this unenforceable edict.