There are 1.6 gal Pressure toilets that use line pressure to compress an air pocket in a holding tank to give you an impressive flush. You RARELY need a plunger, at worst, just wait for the tank to recharge in about a minute, and give it another blast. Gerber makes a good one.
I just bought one to replace an old cracked (high-flow) toilet. I think it might even be 1.3 gal??
It still scares my wife a bit with the force of the flush! (That is - being a very strong flush). I was a bit leery, but reading the reviews it sounded like it would be okay. So far, so good. Although I guess that if it does get clogged, I’ll need to use a snake, as the design doesn’t allow for a plunger to be used.
We replaced one of our toilets with a 1.6 power flush toilet over 20 years ago. I think maybe one clog in that time.