Performance
When it comes to horsepower, the MAZDA6 packs quite a punch and will knock the Chevrolet HHR down a few rungs. However, remember that high horsepower engines often command higher insurance premiums.
The Chevrolet HHR is likely to feel slightly slow because of its high horsepower-to-weight ratio.
Handling
With their similar turning circles, the Chevrolet HHR and the Mazda indubitably handle about the same into and out of tight spots.
Drivetrain
The Mazda MAZDA6's engine is markedly larger than the Chevrolet HHR's. Remember that more massive engines may use more gas than smaller ones.
Torque is the force that lets you accelerate quickly, and in this respect, the Mazda MAZDA6 is quite a bit more powerful than the Chevrolet HHR.
The Chevrolet could learn a lesson or two from the Mazda MAZDA6 when it comes to pickup.
Utility
Neither the MAZDA6 nor the Chevrolet HHR has a marked advantage when it comes to seating capacity.
Convenience
The Mazda MAZDA6's fuel tank will need to be replenished slightly more often than the unit in the HHR.
You'll most definitely take the Mazda MAZDA6 for a fill-up approximately as often as the Chevrolet HHR.
Comfort
While the front cabin in the HHR offers a bit more head room than the Mazda MAZDA6, there frankly isn't much of a difference.
The Chevrolet HHR offers more head- and leg-room to your passengers than the Mazda MAZDA6 does.
Dimensions
The HHR is likely to feel a little slow because of its high horsepower-to-weight ratio.
The HHR's tank is approximately the same size as the MAZDA6's, though the Mazda MAZDA6's is somewhat larger.
The Chevrolet HHR rides lower than the Mazda MAZDA6, which is a good thing for its center of gravity and ease of access.
The HHR and the Mazda compete for the same parking spaces.
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 Mazda MAZDA6 to the dealership as the Chevrolet HHR.
Producing an exact gas mileage evaluation is so tough that some think not even the federal government can do it, but it looks as though the Chevrolet is the winner as far as fuel economy.
There really isn't much of a difference in gas mileage here, but if you must know, the Chevrolet is somewhat more economical than the Mazda MAZDA6.
The Chevrolet HHR won't save you much money at the pump compared to the Mazda MAZDA6.
The Mazda MAZDA6 is tremendously more expensive than the Chevrolet HHR as far as MSRP.
Overview
The basic after-sale protection that comes with the Chevrolet HHR isn't quite as generous as the Mazda MAZDA6's.