What is your question?
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What is your question?
Flapping noise under car, front drivers side, only when driving 60-70 mph, on Interstate.
What makes this problem better or worse?
Only happens when driving on Interstate, 60-70 mph.
How long has your 2017 Honda Fit had this problem?
One day when driving on Interstate.
There are certainly more possibilities and this may be difficult to pinpoint since the actual conditions cannot be duplicated while searching for the source with vehicle in service bay. Good luck!