If you get another 'cane like Irene or Aurthur, it is going to be a lot deeper in Avon. Dorain and Matthew winds dominated from the north after they passed, so pushed more water into Frisco, Hatteras, and Ocracoke. The tracks of Irene and Arthur were such for the winds to dominate out of the west, and Avon, and the Tri-villages got deep water. it was 4' deep on NC12 in Waves in Irene, and 2-3' deep in Avon for either Irene or Arthur on NC 12up by the Outer Beaches office. So OP, your next vehicle may not last very long. I just dunno a high spot in Avon, like at Billy Mitchell airport as mentioned.
If you do.... DON'T park it under your house and DO disconnect the battery before the 'cane. Salt water will short out the car's electrical system and the energy in the battery is enough to set a car on fire if it shorts in the right spot. We had a car in a carport near us in Irene that caught on fire due to the electrical system shorting in the storm surge. The only reason that the house did not burn down was that the Salvo fire chief lives 1 block away and saw the smoke, and they went out in the receding storm water, partly controlled the car fire, threw a chain and hook through the back window of the car, and dragged it out still smoldering. The carport was singed black... it was that close.