I had a client today who always gives 110%. Yes, he reaps rewards, but he's stressed out much of the time, makes mistakes as a result, and hasn't developed close personal or professional relationships.
The most successful people I know give 90%. They try but rarely push themselves to the max. They stay in the moment, tackling whatever they're working on slow but steady, and don't waste time worrying about what's ahead.
They probably get a little less done than a 110%er but have the emotional reserve to not burn out, develop relationships, and enjoy whatever it is they're doing.