Does Kakashi's Sharingan use more chakra than the Uchiha clan members? As in Naruto, Kakashi used his Sharingan only during a combat.

Where as the Uchiha clan members (mainly Itachi and Madara), used their Sharingan almost all the time. 

So, does the Sharingan consume more chakra in the case of Kakashi as compared to an Uchiha?
To directly answer the question, NO, it doesn't.

Theoretically, I think the consumption/amount of chakra using Sharingan comparing to other Uchihas is the same. They only differ on how they use them with their bodies. We all know that Uchihas (mainly Itachi and Madara) has bodies mainly adapted to use Sharingan thus making them efficiently use it in battles. On the other hand, Kakashi retains his body (which is not Uchiha's) causing him to use Sharingan inefficiently which in return produces waste chakra during its usage.

Sharingans are like weapons - same weapon requires equal strength in order to use them. But no different body can use the same weapon.



Don't get me wrong, the other answer is still correct. But does not necessarily answers the question.

Update

In addition, as per @mirroroftruth, Kakashi can't deactivate his Sharingan. Active Sharingan constantly use chakra.