If there is nothing wrong with the car, it is supposed to get regular gas.
If you can't run the car without premium then you have a problem that needs to be fixed.
No Crown Victoria/Grand Marquis/Town Car needs premium fuel until it is tuned for it, the only Panther vehicle that is supposed to use premium is the Marauder.
I went with higher output coils and had to go with a colder plug because I had a high RPM ping on regular. The colder plug got me going without any issues though.
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