Fellow model S owners, please check your 407 bill. I had 407 take pictures of my plate instead of relying on the transponder. The first time I check my bill in over 6 months and I found that they slap on some average kms if they couldn't take your license plate at either entry / exit. For me, the average calculated kms is way more than what I usually do. I thought they would calculate the distance between last entry or exit but they don't. So, please check your bill.