"Green vehicles" Just to put into perspective. .
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. 3/4 of USAs energy consumption is fossil fuel. Out of all of that energy a tiny part is delivered via electricity through wires and not all the energy consumed makes it to the electric wheels on the road.
Meanwhile gadgets added to engines just change emissions from one type to another. Catalyzers and egr valves increase CO2 and do less MPG. If you want reduce emissions just drive 10 mph slower.
A bit like phone chargers, samsung/apple/LG/ etc put a message on the screen saying "charged, unplug and save the planet" is a warm green feeling at corporate level for them (which people loyal to the brand can participate in), but there's thousands times more enegy escaping through hot water pipe lagging or hot water tank jacket.
In a way a egr blanking off plate is just another phone charger left plugged in the big picture.
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