Utility
The Impala will quite certainly prove more convenient than the Toyota for those of you with frequent kid-cargo.
Dimensions
The Chevrolet Impala's tank is roughly the same size as the Toyota Avalon's, though the Toyota's is a little larger.
The Toyota Avalon and the Chevrolet Impala compete for the same parking spaces.
Convenience
You'll quite certainly have to take the Impala for a fill-up more often than the Toyota Avalon because of its tank size and gas mileage.
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 Toyota to the dealership as the Chevrolet Impala.
Producing an exact fuel economy evaluation is so tricky that some think not even the federal government can do it, but it looks as though both the Toyota Avalon and the Toyota Avalon perform approximately similarly as far as fuel economy.
There honestly isn't much of a difference in gas mileage here, but if you must know, the Toyota Avalon is somewhat more economical than the Chevrolet.
The Chevrolet Impala is considerably less costly than the Toyota Avalon with respect to MSRP.
Handling
With their similar turning radii, the Toyota Avalon and the Chevrolet Impala definitely handle about the same into and out of tight spots.
Drivetrain
The Chevrolet Impala could learn a lesson or two from the Toyota Avalon regarding pickup.
Torque is roughly equivalent to acceleration, and in this respect, the Toyota Avalon is significantly more powerful than the Chevrolet Impala.
Comfort
While the front cabin in the Chevrolet Impala offers a bit more head room than the Toyota Avalon, there really isn't much of a difference.
The ampler interior dimensions of the Toyota Avalon make it considerably roomier for your passengers than the Chevrolet Impala.
Overview
The Chevrolet Impala and the Toyota Avalon have the same basic warranty.