Kelly Blue Book lists the price of a 2005 Chevrolet Impala with 100,000 miles as $4,694-$10,767. There is such a wide gap in prices due to the condition of the vehicle as well as various options an individual car may or may not have and whether it is being purchased from a private party or a car dealer.
The low end of the spectrum is the value of a base model 2005 Impala in fair condition from a private party. The higher end is an excellent condition Impala SS from a dealership.
The SS has bells and whistles the base model does not come with. These include a tachometer, leather trim, a stronger engine, bucket seats, 17” silver aluminum wheels, a supercharger and sport-tuned suspension.