Utility
The Dodge Caliber and the Saturn Astra can accommodate the same number of passengers.
Dimensions
The Saturn's tank is about the same size as the Dodge's, though the Dodge's is a little bigger.
Convenience
The Saturn Astra's fuel tank will need to be replenished a tad more often than the unit in the Dodge Caliber.
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 Dodge to the dealership as the Saturn Astra.
The Saturn Astra won't save you much money at the pump compared to the Dodge Caliber.
The Caliber won't tax your gas budget significantly more than the Astra will.
The Dodge Caliber isn't much costlier than the Astra with respect to MSRP.
Warranty
The Saturn Astra and the Dodge Caliber have the same basic warranty.