I did a search to see if I could find anything on this topic and didn't come up with anything.
Anyway, this morning I was at LAS waiting to fly to Denver. I was watching take-offs and noticed that two Air Tran 717's in a row left quite a smoke trail. It reminded me of the old days with the 707's and DC-8's. I watched all the other types that took off after that, including an old 732 and none had any noticible smoke. Only the near new 717's.
Is there something specific in that RR/BMW engine that might cause this result?