Too many variables at once...
I'd put the stock filter back on. I'm not sure if there was an advantage to resetting the ECU with all of the other items -- what SVO was suggesting.
Idling has proven to be a terrible way to warm up. Just drive slowly...
Colder weather hits FE pretty hard.
Give it a couple of tanks, and get a feedback device. The fill-up method may have been flawed.
I'd like to have the option of buying a Prius when things don't go well
RH77