The IRS cuts are the most obvious ones, since they will clearly end up losing the government far more money than they save. But it would be an interesting, if

The IRS cuts are the most obvious ones, since they will clearly end up losing the government far more money than they save. But it would be an interesting, if challenging, project to try to do the same kind of thing with other government agencies. And unlike the IRS, most federal agencies don't generate revenue directly for the government but likely have indirect economic benefits. National parks generate tourism dollars, funding for science research leads to new advances with economic impact, etc. The "savings" from the cuts assumes the money is being set on fire with no economic benefits, but even if you disregard the obvious direct impacts like federal employees or recipients of federal dollars buying stuff just like everyone else, the impact of the service being provided is almost certainly non-trivial if admittedly harder to measure. Any reasonable approach to efficiency and cost cutting needs to take that into account.