So far, I've put a dive flag license plate on front, and replaced the gas cap (the gasket was cracked and I was afraid it'd trigger the check engine light). Also got an area rug for the back so the dogs don't completely destroy the carpet.
We've put about 3-400 miles on it now, and no problems yet.
Looks like we're probably going to be getting somewhere around 19-20 mpg average. Haven't actually done the calculations yet, but I think it's got a 15 gallon tank, and it looks like we'll be able to get about 300 miles out a tank.