This topic has rather fuzzy boundaries primarily because the truth isn't always ours to tell. Human being's thoughts and perceptions are easily distorted, and this is the primary reason that using false information is even an option. Since false information of any kind is in conflict with reality, it would seem to be less stable in the long-term than ideas supported by reality. The ability of the human mind to hold on to such distortions is the only things that gives a lie any endurance.
If you take two individuals, both selling crappy vacuum cleaners, and one really believes it is a good deal, while the other is knowingly conning his customers, the result for the customer is equivalent. Did one tell the truth because they actually believed the lie? The more I look at this, the more I see truth as an unattainable ideal.
I do see value in making a consistent effort to communicate what is true to the best of my ability. The point of this is to build credibility and trust long-term. I prefer to think long-term and so I value facing reality as it is and attempting to make it relevant in my communication. There are subjective moments when it is experience an not information that is being communicated, and in that instance I attempt to communicate based on that. For example, I had a dear friend attack me verbally and the information was false, but the experience was an attempt to reach out to be validated. For this reason I apologized for something I hadn't done because this person was craving that validation and was reaching out to me to give it. The truth I told was that I cared about them and that they can count on me to have their best interest at heart. I have later since attempted to gently demonstrate ways the information was false without focusing on it too much. In another example, the old question of whether or not you would tell a soldier where a friend was hiding so they would kill them, no I would be plenty happy to lie to the soldier. This is because the soldier is asking me for the location of a life he hold the right to violate and the answer to that question is "I have not seen any such person". In my thinking, that is as much truth as anything I would know to say.