Here is where this question is coming from. I am purchasing the 6.2l & 4l80 trans today. The 6.2l has the new variable valve timing. If i were to get the new computer that goes with that motor would he be able to program it to work with my existing truck. Or is this a pipe dream. I ask this because it would be nice if i could get a boost in fuel economy while cruising on the highway. Is this even worth the hassle?