I have been told that I sound like a Yankee (by southerners). It always makes me laugh. If I sound like anything it's like a PNWer (Pacific Northwest) since I spent a lot of time there. That would be the accent my kids have if I could hear that accent. I haven't been drawn into the Okie accent so I think I'm wary enough not to let the drawl back in. But I haven't spent much time in Texas since about 1977. That's quite enough to even get the "fixin' to" and " over yonder" out of it. I do notice that I have picked up little things from the various places I've lived. I still say "pooka" for a little hidey hole from when I lived in Hawaii and "Outside" and "Denali" crop up from Alaska. But "tin" is purt near the only Texas thing that remains (anything with "en" at the end comes out "in"). I am on a Facebook site with West Texans and they even write in dialect. I love it!!
Growing up I made a concerted effort to lose the Texas accent. When I came home from the Navy they said I sounded like a Yankee. I didn't really, and after years of living in Colorado I lost the harshness of the Texas brogue. I moved back home in 1995 and, hanging around my cousins, brought it back a little. But I strive to speak perfect grammar. I can write almost perfect grammar but I don't always speak like I write.