I'm new to this forum, but have owned Dodge RAM trucks since 1996. While I've searched forums with keywords on break-in and such, I haven't found anything. My apologies in advance if this is an old topic that I've missed. I'm picking up my new 2011 RAM 3500 tomorrow about 500 miles away. As this is a brand spankin' new (8 miles on the odom), I'm concerned about driving it at constant highway speeds for 6 - 7 hours. Over the years, I've heard various opinions about what to do and not to do. I've also heard that "today's engines" are machined to much finer tolerances that in years gone by, and engine break-in is no longer the issue it once was. So, I've heard that you shouldn't tow because of the added stress on the entire powertrain. I've also heard you shouldn't drive at constant speeds for long periods of time and you shouldn't rev the engine up. Does anyone have any scientific or empirical data (pipe in your gut feelings as well) or details on what engine break-in is recommended these days for maximum engine life and fuel economy? Thanks in advance.