Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. It costs about the same to get the Mazda to the dealership as the Pontiac G6.
With respect to fuel economy, the Mazda Mazda3 bests the Pontiac G6.
The Pontiac G6 pales in comparison to the Mazda Mazda3 as far as fuel economy.
The Mazda Mazda3 is substantially less expensive than the Pontiac G6 when it comes to MSRP.
Utility
Neither the Mazda Mazda3 nor the G6 has a marked advantage in terms of seating capacity.
Convenience
You likely won't have to visit your friendly gas station more often with the Pontiac G6 than with the Mazda3, as both offer similar ranges.
Comfort
While the front cabin in the Pontiac G6 offers a bit more head room than the Mazda3, there really isn't much of a difference.
While the rear of the Pontiac G6 provides a bit more head- and leg-room than the Mazda3, there really isn't much of a difference.
Dimensions
The Pontiac G6 is tremendously more bulky than the Mazda.
The Mazda3's tank is about the same size as the Pontiac G6's, though the Pontiac G6's is a bit bigger.
The Mazda Mazda3 and the G6 compete for the same parking spaces.
The Mazda Mazda3's shorter wheelbase may produce a less-settled highway ride but a more agile feel in daily traffic than the Pontiac G6.
Performance
Regarding horsepower, the Pontiac G6 packs quite a punch and will knock the Mazda3 down a few rungs. On the flip side, keep in mind that high horsepower engines often command higher insurance premiums.
Drivetrain
The G6 has a larger engine than the Mazda3. Remember that smaller engines are often cheaper to fix, but a smaller engine usually has to work a little harder.
The Mazda Mazda3 could learn a lesson or two from the Pontiac G6 when it comes to pickup.
Overview
The Pontiac G6 and the Mazda Mazda3 have the same basic warranty.