automaniac

noun3

1. •
   An enthusiast of automobiles and motoring.

   • A foolish dissipation, ending in broken rest, depleted purses, broken laws, broken automobiles, and broken bones.[…] Is the cost not heavy enough to bring even an automaniac to his senses? — 1902
2. •
   A road hog.
3. •
   A person who is self-involved to the point of mental illness.