I feel they tweak the rules for emissions over there a bit. If you look at several of the top of the line diesel trucks. Do an emissions delete and see a 5 mpg highway efficiency improvement my one friend jumped from 15 to 22 mpg. This is just my thought on the subject. I feel the emissions equal out per gallon of fuel burned between with and no emission. I dont have any numbers to back any of that it's just my thought. Especially in my friends case. Roughly 50% (yeah 50!) more distance traveled on the same amount of fuel. If someone has the numbers of how what all gets taken out by the emissions system. A with without comparison would be awesome! I may be crazy but in my head it makes sense the voices say so lol
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