>> L4 total comp at Google, or E4 salaries at Facebook, is about $260K/year ... Average total comp for a software engineer in Dallas is $110K/year
You're using average (median I hope) salary for Dallas vs. high end salaries for San Jose.
You used indeed.com for the Dallas salaries, if you use them for San Jose you get an average of 150K. Too lazy to run the numbers but obviously that would change the calculation quite a bit.