Haven't bought a car for years. Trying to understand how much discount we can get in the negotiation.
Here is some cases:
Failed case: 车来车往
2011 Dodge Caravan (Canadian Package)
List price    $20,995
Offer price  $20,000 (all included)
Discount     $4854
Passed case:朋友
2010 Dodge Caravan (Canadian Package)
List price    $19,995
Offer price  $22,000 (all included)
Discount     $1724
Failed case:自己
2011 Dodge Caravan SXT
List price    $24,995
Offer price  $25,977 (all included)
Discount     $3000
Passed case:车来车往 
2011 Dodge Caravan SXT + Power Convenience Group (+$1500)
List price    $26,495
Offer price  $29,020 (all included)
Discount     $1652
Seems we are looking for discount between $1600 and $3000. May be close to $1600.