Everything is bigger in Texas but Dallas just got really big according to this map at Winco Foods - via reddit.
By comparison - here are their store locations from their online map.
A closer up look shows that while they may have had fun with the ridiculous exaggerations, their locations are also pretty awful. Duncanville is east (not west) of Arlington. Denton is not further west than Fort Worth and Carrollton is well to the west of McKinney. At least they got Lewisville sort of right.