2006 Sonata Wheel well noise
 

Just back from a 1200 mile trip on which we passed 10 k. Its a 6 cyl
and I know this may not sound right but in the flatlands of VA and DE
we were getting 28 mph (spiked up to 29 once??) at 60-65 with AC on
low, no kidding (or at least thats what the trip computer said). My
questions concerns annoying wheel well thumps that we heard peridically
thru the trip. Sounded like a peice of soft debris being thrown up
into the well. While I was driving I did not notice any debris behind
the car on the road when I heard it. Although I imagine it is possible
it was some foriegn object I wondered if this might be some type of
thermal expansion (we were coming and going from extended wooded areas
into open sunny farm lands) on the roof or some other part of the car.
Anybody have something similar going on?..............Doc