Hi Chop,
Airfares are a weird thing, at least from my point of view. Example my Delta booking for my 2006 Sebring visit, Munich to Atlanta then Atlanta to Miami with return from Philadelphia to Atlanta then Atlanta to Munich, this all for €316.00 (Euro). If I was to book only the Munich to Atlanta and return Atlanta to Munich flights the price was €368.00...same days, same flight numbers...figure that out
My only advice when looking for cheaper airfares, have patience and do lot`s of internet price searching before you book. Good luck and see you in Sebring 2006, LeMans 2006 and as JP suggests a return to LeMans in 2007.