I drive a 2006 chevy trailblazer with the inline 6 cylinder engine. It has nearly 120,000 miles. It still runs like the day it was new, and I get 20-22 mpg. A coworker told me that a friend of his drives the same model vehicle. He said that he took his to a dealership, and they reprogrammed the car to change the way the torque converter locks. He claims that it increased his low end torque, made it easier to tow, and improved his gas mileage. If this is true, I would like to have it done to mine, but I would like to know what the disadvantages might be. If this programming was without consequence, it would just be the way. Do you guys know anything about it?

Find out what dealership did this and ask them.

I’m willing to bet that when you actually look into this you’ll find out that there was some miscommunication somewhere along the way.