Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. It costs approximately the same to get the Saturn to the dealership as the Honda Fit.
With respect to gas mileage, the Honda Fit and the Saturn Astra don't differ much.
The Honda Fit won't save you much money at the pump compared to the Saturn.
The Honda Fit is considerably less pricey than the Saturn Astra when it comes to MSRP.
Utility
The Honda Fit and the Saturn Astra can accommodate the same number of passengers.
Convenience
You quite certainly won't have to visit your friendly gas station more often with the Honda Fit than with the Saturn Astra, because both offer comparable mileage ranges.
Dimensions
The Honda Fit's tank is almost the same size as the Saturn's, though the Astra's is a little larger.
Warranty
The Astra and the Honda have the same basic warranty.