Well least it was close
You might take the treport to your mechanic
He can tweak it or suggest a fix.

Intersting your 15mph RPM;s were higher than the 25 MPH
I had the same thing
though my RPM's were in the 1300's

They suggest a long highway trip before
maybe even running in a 1 higher or lower whatever it is gear to clean deposits...

Good Luck

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