100k rollback on the speedo is the norm. Modern cars will go 200,000 miles easily if they are well maintained. The interiors wear out before the engines and transmissions. Once in the DR it all changes. The roads, no oil changes and general abuse kill most cars quickly. Toyota cars and Hilux trucks are the exception. They go and go and go in spite of being abused. The bright lights is almost a competition in the DR. I can proudly say that almost no one failed to dim when I lit up the night. They will save you though. Twice I nearly hit horses in the road. One giant horse was sleeping cross wise and never woke up as I passed his nose. The others were just running down the road in the mountains in the middle of the night. Dont drive at night. The sleeping horse was the final straw that caused me to listen to everyones advice on night time driving.