its for emissions. running a car at 14.5 AFR to 4000rpm doesnt pollute like a car that runs 11.0 from 2k to redline. they believe in the knock sensor doing its job to pull timing when it does knock and i think they believe most people just buy the car to have, not to boost around town daily. whatever the reason they have to abide by govt rules.
The should just make the car run on E85 from the factory, much less pollution.
its been awhile since i read up on it but last i saw they say e85 pollutes more than gas in ozone or greenhouse gas. however i have no idea who to believe because it could of been from a gas producers ripping on e85 to sell more. can never trust anyone when it comes to these things.