Anyone able to offer some insight into this? I've had a search and turned up nothing concrete.

Essentially do I add my National account # to an Enterprise reservation and the National program rules apply? (i.e. 1-4 days = 1 credit towards a free rental day)

Have to do some work rentals and have to use Enterprise but would rather put the earnings towards National for obvious reasons (snapshot, last rental w/National was a Caddy XTS with 3 miles on the clock, my last rental w/Enterprise was a hatchback Fiesta with 35k on the clock).