The loathing of the egg crate grill...I'm gonna find a way to incorporate one of these with actual eggs on it into an avatar.
Bart, you mentioned your wife drives the car "short" or "super short" trips. I don't know the history with Black Betty (PCV, OCI's), but one thing you may want to do is take the car out & drive it with some cajone's for a good while, like 40 minutes or so. I believe the term is redneck tune-up perhaps? Then immediately upon returning home, dump the engine oil.
Here's the logic behind my thinking. If the car often sees the following: few miles between startup & shut down, then sees several hours of cool-down, followed by few miles of a return trip home & then shut down again - a condition may be in the process of being created where sludge is being produced. Short heat cycles paired with long OCI's are terrible on these engines. The deposits/sludge forms in the crankcase/oil pan/passages & frees itself of it's various hiding spots when the engine sees use & sustained temperatures that it isn't used to seeing. For example, a perpetually short tripped car getting taken for a spontaneous & lengthy road trip.
Shortening the OCI's & using decent synthetic helps, but the engine needs to be really used to purge the junk out periodically, especially if it's a short tripped car. I don't want to scare you, I'd just hate to see one of your next threads sound like one of mine a while back entitled "No oil PSI message ...etc.." because some sludge broke loose after having been "up to temp" for 3 hours & has now clogged your oil pickup tubes screen, effectively preventing your oil pump from sucking oil from your pan & then providing it to your crankshaft's journals.
One thing I would say to never do is to use any type of solvent in your engine oil, unless previously used without negative results. They can break down the sludge/gunk too quickly & then that stuff ends up clogging the pickup screen. It's very important to get the junk out of the engine, but you don't want to do it too quickly.
Aside from the redneck tune-up, everything everyone else has mentioned, I'd also bring along a jump pack (one with an air compressor), a jerk strap (in case you inadvertently go off-roading & can't extract yourself), and a spare ignition coil.
Lastly, when we road-trip from MN to the west we use Shell's trip planner. They have arguably some of the best fuels available & the mileage is the proof in the pudding.