Truck has been running normally the last 3 days. No more DRIVE TO CLEAN message. It just seems strange that it triggered after a single incomplete regen. Normally I do go 250 to 300 miles between regens. My driving is mostly commuting about 20 miles to and from work, which is about all highway unless I need groceries. A couple of things that may have triggered the DRIVE TO CLEAN message: filling up with lower grade fuel than I normally use (40 instead of 45 cetane) and running out of Diesel Kleen, and I had just accelerated hard up a pretty steep hill, which probably caused a high back pressure reading on the DPF. The truck seems to be running rougher than normal on this fuel, and I'm down about 1 MPG from normal.