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Discount Tire is just one of those few synchrony accounts that don't interest them and is why you never see much of a usable limit or increases very often.
I would focus on those that have potential to grow with synchrony.
Just keep at it and leave that one in the shadows. They do so much better with many other of their cards but not that one.
@AJC
Yeah, I got HPed on a CLI request to my Pepboys card. That isnt what upset me. I requested the CLI before I joined myFico
and only asked for a $1500 increase. DEFINATELY left money on the table LOL in fact, the HP falls off my EX next month