Here's the scoop - Made a reservation at National through EA for mid size, with NHOL - DC ID and Entertainment coupon.($194 incl) . Later modified it to full size (which bumped me to counter service $206)) Called today to verify free spouse driver and reservationist said, wait, you can't use this coupon with NHOL. Explained that if I show up with reservation as it is, they will disallow the coupon or the NHOL and I'm likely to end up with a MUCH higher rate - will have to argue with counter and what a hassle at the beginning of vacation. SHe repriced without coupon and cost was about $227. I hemmed and hawed and said I had another car booked for $196 but for $10 more would take National but didn't know about $30 more. SHe put me on hold and came back and said supervisor did override and that I would have the full size for the $206, but would have to check in at counter (no big deal to me) MY questions is, of those who have combined these codes before, have you ever had the combination not honored when you ogt there? The coupons and rules for all these discounts clearly state that they are not combinable. I asked reservationist why they didnt' fix the website to disallow it? Also, if you reservation is counter service can you check in and then still go out an pick out your car?