[Diesel_Dave]

Dad,

I really wouldn't be concerned too much about fuel dillution at light loads unless you have some info from an oil analysis showing it. Since the advent of the common rail, the injection timing is adjusted for different speeds & loads. Older, mechanical fuel systems had to keep the same timing everywhere. Especially if you're running stock, I would be suprised if you had any issues. That being said, if you're concerned about it just have an oil analysis done.


slowmover,

ECM's don't "adapt" over time. In some cases, it can go into or out of different control modes/look-up tables (steady-state, transient, high altitude, etc.), but the ECM doesn't "learn" anything. Eventually, that might happen (I've talked about it a little with other folks in the industry) but it's not in production today. The technology is actually out there to be able to do such things. One of the biggest problems, however, is dealing with the EPA--how can you prove to them that it will always meet emissions if it's always adapting itself? It's not impossible, but it's really difficult.

I'd say the difference that you notice after pulling your trailer is psychological. Just like like when you ride in a car again after driving your truck so much and it feels so wierd that you're sitting so low to the ground.