Those adjustments are for places that don't have good gasoline. Most dealers won't change the settings, claiming it is illegal and will cause more pollution. If you get the dealer to change them, you will get reduced performance and economy.hlea34 said:hm, we can go to the dealers and change it? how much do you think that cost though? i was given a mercedes as a present and even though i love it a lot, gas seems like it is gonna be expensive.