No! Cost is $27.78 per $1,000 on a 36 month 0% interest deal. It's just straight math ($1,000 / 36 months). However, with the 4 month no payments, it might be slightly higher, probably closer to $31.25 per $1,000 ($1,000 / 32 months).
So if you finance $24k, your payment would be $750/mo ($31.25 per $1,000) or $666.72/mo ($27.78 per $1,000).
I won't dare get in the middle of everyone's financial matters, but I think for most that is a pretty stiff payment for most folks. Although the luxury of being DEBT FREE of a car in 3 years is rather appealing if you can afford it.
In regards to the "rebate". It's real. We just bought our '11 Nox on 11/30 and it was offered to us. We wanted the rebate deal but didn't like the terms, so we used our local bank on a 5 year term.
For those thinking of taking the money and doing a refi, be sure to read the fine print. Usually you have to make X number of payments before you refi or you risk having to pay back the rebate. Which then makes it interesting...with 4 months of no payments, even if you had to make 2 payments, theoretically that would push your refi out 6 months. Just some food for thought.