Agreed. But the air under the car is higher pressure than that going over the car causing lift as well as drag. I'm just suggesting one could divert it into the low pressure space behind the Crossie's big butt.

Duct taping a garage door gasket to the front lip helps reduce this. I see it done on Mustangs and ricers all the time. It adds as much improvement as the best flame stickers available.

No air scope required.