Utility
The Impala will most certainly prove more convenient than the Avenger for those of you with frequent kid-cargo.
The Dodge Avenger outpulls the Chevrolet Impala by a massive margin.
Dimensions
The Chevrolet Impala's tank is roughly the same size as the Dodge Avenger's, though the Dodge Avenger's is somewhat bigger.
The Dodge Avenger and the Chevrolet Impala compete for the same parking spaces.
Convenience
The Chevrolet Impala's fuel tank will need to be replenished more often than the unit in the Dodge Avenger.
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 Dodge Avenger to the dealership as the Impala.
The Impala will tax your gas budget substantially more than the Avenger will.
In terms of MSRP, the Chevrolet Impala costs considerably more than the Dodge Avenger.
Handling
With their similar turning radii, the Dodge Avenger and the Chevrolet Impala most certainly handle almost the same into and out of tight spots.
Drivetrain
The Chevrolet Impala has a bigger engine than the Dodge Avenger. Remember that smaller engines typically get better gas mileage, but smaller engines can be stressed more.
The Dodge Avenger could learn a lesson or two from the Chevrolet Impala in terms of pickup.
The Chevrolet Impala packs quite a wallop compared to the Dodge Avenger in terms of torque, which is the force that lets you accelerate quickly.
Comfort
While the front cabin in the Dodge Avenger offers a bit more head room than the Chevrolet Impala, there really isn't much of a difference.
The Chevrolet Impala is not particularly more spacious for your passengers than the Dodge.
Overview
The Avenger and the Impala have the same basic warranty.