Negotiating price with Xplan?

I got my using plan and I don't see how you can negotiate a better deal. It's 1% over dealer invoice without any haggling. After my trade in, I'm paying $60 less a month on my car payment. It's like they are paying me $60 a month to take the car off their hands. At least that's how I look at it.

I've seen quite a few base '12s going for $26k in the window ($30k MSRP), don't even have to haggle...can you also X-plan them down from that?

xplan is 1% over invoice. not msrp. My car was $37k msrp and I got it for $31k. If you can do better than that haggling go for it.

X-plan is a no- haggle price

I just got my Mustang using the plan. Sticker on the car was 24595. I added a custom hood/paint for $1300, and had a $3500 trade-in, and ended up with an out the door price of $22,880. There was no negotiation.

I'm more than satisfied.

Dealers receive a set price from Ford for selling a car under Xplan. You can get a number if you are a member of the Mustang Club of America. I believe on most Mustangs it is about $1500 off. The discount varies on different Ford models. If you search the internet, you can find the code you need to access X-plan info.
Dealers may also give you less trade in on your car if you are buying on X-plan. That's one way they can increase their profits. Know what your trade in is truly worth. I have purchased many cars, not just Mustangs, on X-plan with no problem.

"Dealers may also give you less trade in on your car if you are buying on X-plan" I think this is definitely true. Unfortunately, you are technically supposed to announce that you are eligible for X-Plan right away and they have the right to adjust your trade in value or deny you the x-plan if you don't. Still though, it may be worthwhile to first shop your car around to a couple dealerships without X-Plan just to see how much your trade in is really worth. My old car got offers anywhere from $1,200 up to $1,900 depending on dealership.

I ended up buying my Mustang used and after we negotiated price ($32,000 which covered everything except for registration for a 2011 Mustang GT CS Automatic glass roof with 8K miles back in March 2011 when they had bought it for $39,000 in October 2010), the seller offered to take my car in trade for $1,250 off of the price. I probably could have gotten more selling my old car myself but this was zero hassle for me and this was worth it to save myself the time and headaches.