Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. It costs roughly the same to get the Saab to the dealership as the Audi A6.
The Saab doesn't pale in comparison to the Audi A6 with respect to gas mileage.
There really isn't much of a difference in gas mileage here, but if you must know, the Saab is a little more economical than the Audi A6.
The 9-5 is significantly less expensive than the Audi A6 in terms of MSRP.
Utility
Neither the Saab 9-5 nor the Audi A6 has a marked advantage in terms of seating capacity.
Convenience
You will definitely have to visit your friendly gas station more often with the Saab than with the Audi A6.
Comfort
Taller drivers will significantly enjoy the extra head room in the Saab 9-5's front cabin compared to the A6.
The Saab 9-5 is not particularly roomier for your passengers than the Audi.
Dimensions
The Audi A6 is considerably more bulky than the Saab 9-5.
Your wallet will hurt more every time you fill up the Audi A6 than the Saab 9-5 because of its larger tank.
The 9-5 and the Audi compete for the same parking spaces.
Handling
With their similar turning radii, the Saab 9-5 and the Audi A6 definitely handle approximately the same into and out of tight spots.
Drivetrain
The Saab 9-5's engine is substantially smaller than the A6's. Remember that smaller engines can be stressed more; however, smaller engines typically get better gas mileage.
The Saab could learn a lesson or two from the Audi A6 regarding pickup.
Warranty
The Audi A6 and the Saab 9-5 have the same basic after-sale protection.