No, personally I don't think it's unsafe. However, it very well may trip the check engine light to come on since it would pick up the open gas cap as an emissions/EVAP system failure methinks.
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-Chris
2004 Porsche Boxster 2.7
1991 Porsche 911 C2 Targa 3.6
2017 Subaru Outback 3.6R
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