We're pretty much used to the new engine now.  The last long trip to Ohio went well, with the van roaring up the interstate hills here at 65 - 70 mph.  Just don't let the speed drop below 60, though, since it falls off the torque curve and then the speed drops until you have to downshift.
Fuel mileage has improved from 21 - 23 to almost 26, which is a welcome improvement as we near $4 gallon for regular gas.
Strangely, the end of the oil dipstick broke off at the top hole drilled into it for oil measurement.  Why they drilled holes, in addition to stamping the measurement points into the blade, I don't know.  A new dipstick (with the same holes) was $18, and I hope to find the end of the dipstick in the bottom of the oil pan when I change the oil shortly.
Coolant needed to be added for several weeks after launch, since the system appears to take awhile to purge itself.  It's been a month now without needing any, so that's fine, though I still need to bite the bullet and fix the leaking heater shutoff valve.  It will soon be too warm to ignore it.