Kilometer accounting: Question of a financing Newbie

Tach together, so far I have always paid for my cars in cash, but think for the next vehicle via a private leasing. So far I was only familiar with the variant “Determining a residual value” at the end of the run and therefore surprised that there is also a billing by kilometers. I can estimate my annual driving performance quite well, why this variant sounds attractive at first. Now to my question: Do you hide yourself with this variant tripping? g to be not at the end of the term, right?