Interesting observations. But
Interesting observations. But these systems are designed to improve EPA mileage ratings not necessarily reduce total emissions. But why should I care? I own the car and am not going to put up with an annoying system that some mechanics are claiming resorts in premature wear to several components - including timing belts/chains. My Honda Odyssey had a VCM system that shut off cylinders on the highway to save fuel. Unfortunately it caused expensive engine repairs - so I and every Ody owner I know have installed devices that disable the VCM system. I have absolutely no concern that the EPA is going to come knock on my door - and would tell them where to go if they ever did. Some of us don't blindly obey every inane regulation that comes out.