[dogma1138]

No, modern tanks are set often higher and the toilet has better flow.

What matters is how high the water falls and at what rate not the overall volume of the flush.

Modern toilets that flush about 7-9 liters for a number 2 flush are considerably better than the older ones that whilst flush almost double the volume do it over a longer period of time.

Toilet flush is basically a push if you do it with more force as in the water displacement in a given time frame is higher it would flush better than a higher overall displacement over a longer duration.

The other upside of modern toilets is that if they do clog they don't overfill.

That said over a lifetime of 30 years using only water saving toilets I never seen one clog in a residence I've seen a few public ones already clogged but who knows what they tried to flush there.

If you having so much problems I would take a look at your plumbing or diet you so won't need to use half a roll of TP to wipe your ass.