Other Car Rental Programs/Partners (ie. Alamo, Enterprise, Sixt) - Enterprise deals on 30 day rental

HI

I have a 30 day rental forthcoming;

Any deals that I can top it up with - say free upgrade? Or a free day at the conclusion at another state? Or any reward points they have that can be used later?

Enterprise does not have or participate in any rewards programs.

You may be able to use/find some free upgrade coupons somewhere, or you can negotiate for a free upgrade if you purchase a tank of prepaid gas or something like that.