The Mazda 6 stood out as a more engaging drive compared to standard sedans like the Camry or Accord. Upon its major redesign and SkyActiv updates in 2014, Mazda provided the 184-horsepower 2.5-liter four-cylinder paired with either a six-speed manual or automatic transmission featuring paddle shifters. Reviewers highlighted the lively engine response, accurate steering, and nimble handling, though the ride quality suffered from excessive firmness.

For the 2021 model year, the Mazda 6 received technology upgrades that made Apple CarPlay and Android Auto standard equipment. It remained a strong contender against the Toyota Camry, Hyundai Sonata, and Honda Accord, earning second place in Car and Driver's ranking of top midsize family sedans for 2021. This recognition came despite facing newer competitors with updated platforms and features. As the final year for the model in the United States, its value retention is notable given the platform's age.

KBB estimates place the 2021 Mazda 6 resale value near $14,850 for 2026. Comparing this to the original base price under $25,500 reveals a 41% loss in value over five years.

The figures match Mazda's typical depreciation pattern

CarEdge reports indicate that new Mazda cars and crossovers generally lose 40% of their value after five years. This matches the experience of the 2020 Mazda CX-5 and Mazda3 hatchback. The 2021 Mazda CX-30 stands apart with lower depreciation at 14% over three years per recent KBB revisions. This performance is notable since the CX-30 shares its roots with the fourth-generation Mazda3 yet holds value better than the hatchback equivalent.

The 2021 Mazda 6 resale figure of about $14,850 corresponds to a trade-in value of $12,800 according to KBB. Edmunds data for the higher-end Carbon Edition, originally priced at $32,950, projects trade-in values from $18,303 in excellent condition down to under $17,000 in average or poor shape. This results in a depreciation rate of 44.5% for the Carbon Edition, exceeding the brand average, which is common as premium trims often depreciate at a slightly higher rate than base models.