Well mate it has to do with the Transmission... sure you can have two cars with pretty much the same HP at the tires but to spin the tires its all about the amount of torque you have going to your tires
Also GM Good Ford Bad !!! :D
Also it has to do with the power bands that fords have they have less power stock at idle then Gm's do its their way of stating that they are more fuel economic. But yeah i wouldn't own a sable if it was givin to me... They are junk... Go sell it and buy another impala.