I don;t think you can gleen anything telling in the sales mix. What clearly stand out is the sg&a costs. I beleive if you read the 10q you'll find they explain the resean behind the increase. They also sight increased fuel costs as having a 22 basis point effect.
All in all, it is given that as their sales growth moves into the major's, they will see some mrgn erosion. However, as is the case for almost all that sell to the major, it should be made up with volume