According to View from the Wings, Here is few things we need to do to ensure miles properly post without further request.
1 book via delta.com(we all know that)
2 if you have wizard number with Avis or Fastbreak number with budget, DON'T
give them when you pick your car because this will trigger the AWD code under ur profile.
3 if you have wizard number with Avis or Fastbreak number with budget, DON'T
use the credit card under your profile.
4 make sure your FFP is there when you pick up ur car
The bonus will be triggered by Delta miles posting and booking via Iseatz.com(delta website car booking engine)
I just made reservation for 6 rentals, 3 for me, 3 for my wife. We actually need a car for 3 days in Los Angeles Area, so the extra cost is only for 3 days. Anyway, total cost $224, total miles earn 60294, enough for 2 business class anywhere in Asia. Not bad!!
Another thing is If you drive 75 miles or less for the rental and you fill up the gas by yourself, YOU HAVE TO KEEP THE RECEIPT AND SHOW THEM, OTHERWISE, YOU WILL CHARGE $10.95 for BUDGET or 13.99 for Avis.