I am a little confused. I have calculated the tracking difference of an Index and an ETF using the return getting 0,4% tracking difference per year. I have then leveraged both, the Index and the ETF to a lever of 2 getting 0.63% tracking difference per year. I have then done some testing with hypothetical value and got 10% unleveraged and 20% levaraged with an lever of 2. So, $$ \text{leveraged tracking difference} = \text{lever}\times(\text{unleveraged tracking difference})