is there a seasonal pattern to MB incentives or USAA/fleet discounts?
 

I ordered a car about 3 weeks ago and was told March production and April arrival at the dealer (suburban nyc area), but another poster here ordered (after me) from MB Manhattan and was promised late Feb...making me think my dealer might have some flexibility and leaving me wondering if I should push for March instead of April.

So, I qualify for a fleet discount that is the same level as USAA...I'm wondering if the best guess would be that the discount would be higher in March than April (because March is a quarter end), or higher in April than March (because it is later in the model year). Any ideas?