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Just put on a choroplast grill block. At first i noticed it seemed like it was struggling to gain speed from a stand still. On the way to work i could notice the difference but couldn't tell if it was good or bad. On my way home i finally felt the difference. I was gaining about 2 mph extra on some downhills, and on the flats i could maintain 3-4mpg over before. I still need to make some more runs before i can quantify any gain that i'm getting.
My concern is that my car might be working harder for air on accelerating so i could be losing mpg. But i don't know too much about how cars work.
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