I can only agree with what everyone else is saying. I was you a year ago, although with Ireland the added factor of driving on the other side of the road.
1) Hassle of registration, regulations compliance
2) lack of parking, particularly in urban areas. Don't let the imminent arrival of your car force you into renting a place with parking. In many areas, housing is the tricky bit; get that settled, and let the accessories / amenities follow.
3) greater availability of public transport. Also, the availability of car share and Uber-like services. And the plausible year-round use of bicycles or scooters.
If that doesn't convince you:
4) lousy relative gas mileage, from a US-geared 4 speed. Remember, you'll be paying $6 per gallon. Even older cars here are 6- to 9-speeds, and the gear ratios are set to maximize fuel economy.
5) Maintenance and repair: if you get a look-see trip, stop by the local Toyota dealership (if there is one) and ask them about the availability of spare parts for your car. While the xD is based on the Toyota B platform, the shop's mechanics will have no familiarity with the xD specifically, and any parts specific to it will probably need to be ordered. Expect trial and error, and longer times in the shop.
I do agree with
@Bernard --if you had a classic or rare car, having the company import it would be a good opportunity to make money selling it. Alas, in Ireland you had to own it six months prior, so I missed the window.