Quote:
Originally Posted by seymore4
Because they need one cookie cutter tune to fit thousands of cars that will be all driven in vastly different conditions in different regions of the world with different levels of maintenance and mods..
Every engine is different and will not perform identically as the next, you can always benefit from a custom tune
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Make note this cookie cutter tuned to handle both high desert heat to low Canadian snow to Seattle's endless rain.
Whenever you change anything to aftermarket parts, you're deviating from the original manufacture specs where the manufacturer set it to handle wide variety of environments.
If you know you're not cross country from Canada to Mexico and just leaving your car within your environment, a tune will definitely increase both power and gas mileage because you're narrowing the engine's expectancy in dealing with environmental temperature and humidity ranges to best suites your local environment.