Mill fully accepted Bentham's devotion to greatest happiness principle as the basic statement of utilitarian value: ... actions are right in proportion as they tend to promote happiness, wrong as they tend to produce the reverse of happiness.

Why did Mill disagree with Bentham?

Both thought that the moral value of an act was determined by the pleasure it produced. Bentham considered only quantity of pleasure, but Mill considered both quantity and quality of pleasure.

Is there a difference between the utilitarianism of Bentham to that of Mill explain?

Bentham is what scholars today call an act-utilitarian, whereas Mill is a rule-utilitarian. ... For example, according to rule-utilitarianism, it would be wrong to steal my neighbor's car since this act would violate the rule against stealing, and we endorse the rule against stealing since it promotes general happiness.