By tolerance I mean a situation when a person has been taking a drug for some time and needs higher and higher doses for the same effect. Obviously, natural tolerance may vary among people as well.
Clonazepam is around 10 times more potent by weight than diazepam, so 1mg of clonazepam + 5mg of diazepam isn't going to be stronger than 3mg of clonazepam alone. Be careful with benzodiazepines, if you don't need to take them, then by all means don't. The addiction to benzodiazepines is very hard to kick, both the psychological and physical symptoms of withdrawal are horrible. It's been 8 months since I quit clonazepam after being on benzodiazepines daily for 9 years, the withdrawal seems to be long gone, but the persisting depersonalisation/derealisation makes my life very hard to live. Trust, you don't want to find yourself in such a state.