Last month, I used A153700 for a two week minivan rental in Vegas.
Got it for $612 total, all in. That was a great deal.
During the res. process on Avis.com, I also entered a free gas tank coupon and everything seemed OK.

When I returned my minivan, the clerk could not get the coupon working, and then after some verifications said: "oh, you are an Avis employee! You should have told me before! We can't apply a coupon to an employee rate, didn't you know that?... (I acted like it curiously neved happened to me in the past... bla-bla, and then we had small talks on how we were treated in our respective station )

Anyways, that were some intense moments that could have been quite embarrassing...
(So don't attempt to apply any coupons with above employee codes; that should save you to make a clown of yourself...)

PS Just for info, I saved more than $80 in taxes just by picking the car on the strip (vs LAS airport)