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Since v2.3, new cars added to the game can be upgraded either with Credits or Tokens. However, the highest cost for maxing out a Class D car drastically jumped in the Tenerife Update with the BMW M3 Sedan, which costs 2,059,330 to max out.
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It is notable though that while introducing this new era of high prices, it's mainly done by bringing in new cars to the game - the upgrade (and purchase) costs of the vehicles that are already found in the game aren't drastically modified. This radical shift upwards in the upgrade (and purchase) costs of the cars has led to significant discrepancies to the relation between the upgrade costs and performance gains when upgrading a vehicle. The SSC Tuatara is the first car to have higher upgrade costs. The upgrade costs of the cars introduced in the Fuel Events Update fall mostly between these two ends. The original cars of the game with blue and white license plates and all pre- Fuel Events Update cars (until after the introduction of SSC Tuatara around April 2014, which was the first car with higher upgrade costs) can be upgraded to MAX level with considerably less amount of Credits compared to the cars that were introduced in updates after the Fuel Events Update. The price of the upgrades rises on every level and it also costs more to upgrade a higher end or more recently added car. Vehicles of Asphalt 8 page features a summary table of costs to max out the vehicles.
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The upgrade prices of each level can be found from the car pages.
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The maxed out top speed stat is a certain number higher than the stock top speed stat. The maxed out acceleration stat is 11/ 15 (73.33%) of the stock acceleration stat the maxed out handling stat is the stock handling stat + 0.05 Gs and the maxed out nitro stat is usually the stock nitro stat multiplied by 1.5. Rank (when the car is either stock, MAX, PRO, or MAX+PRO) is calculated as: (34.7-SQRT((34180.823-92.692*Nitro)/Top Speed+1014.173))*1000 - This is assuming the unit system is set to metric.
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