Off the shelf maps are hit and miss.
For some cars they will make great power. For some they will be dangerous. For the overwhelming majority of people they will be very conservative, and leave a lot of power on the table. A custom tune is the only way to know for sure what your engine is capable of safely doing.
If you have no issues with the 49 state map then I would use that. If there are any problems, it will be pretty obvious. Just stick to chevron/76/etc brands of gas and you should be fine.
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