I noticed in the How Often Do you Change Your Oil thread people were stating how many times a year they were changing their oil based on how many miles they drove. I know a few people who only put 5k a year on their vehicles. I'm somewhat envious because their vehicles last so long but I just love to drive to much to put that few on a year. Currently I'm at around 15k but I've gone up over 20k depending on my commute. So... how many miles do you put on your truck a year?