I'm from Texas and we've always said DEEtroit, sometimes adding "City" after it. We also say INSurance, not inSURance; PEEkahn, not peCAN. And "pop" is the sound a firecracker makes, so we drink soda or Coke (no matter what the soda really is).
I like it that different parts of the country speak mildly different "dialects", it gives each region its own flavor.