The answers to the clues below will have something in common.

1. Like church income from tithing
2. She may oversee an estate
3. Certain video game console
4. Historic road from Chicago to Santa Monica
5. Product of a major 1999 oil merger
6. Food category for fajitas 
7. On some roads, it may be several miles after the last one

Answers:

1. Tax-exempt
2. Executrix
3. Xbox
4. Route Sixty-six
5. Exxon Mobil
6. Tex-Mex 
7. Next exit - - - All answers have two X's 

Credit: Dan Naddor