The device was installed according to the instructions. My car's mileage jumped from 400 to 480 miles on a full tank. Over time it got smaller and smaller. Now I'm back to 400 miles per tank. I've had the device for about 3 months and drive to the same construction site every day at an average speed. In terms of performance, I've noticed very little change in my Nissan nv1500 van.
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