I think it's admirable to conserve water and save money. But flushing the toilet after 'several' uses is, in my opinion, gross and akin to living in a 3rd world country. Doesn't it smell? Don't you run the risk of clogging the toilet up, and having to call a plumber in? That would be more expensive than a few extra flushes! Unless you are destitute, or one step away from being homeless, I think a better option would be to install a low-water usage toilet. It's one thing to be frugal. It's another thing to be cheap to the point of being ridiculous.
One woman's frugal is another's wasteful.
Even at 1.6 gal. per flush, I would use more than six gallons a day of cleaned to potable standards water merely to flush, for just me.
When my son was home, and I was with my ex, we used if it's yellow let it mellow, if it is brown, flush it down.
Now, once I own my home, I will have a one pint flush (seen on RV or marine applications) loo, but until then, I do what I can. I also don't flush paper, so clogs are extremely unlikely.