Installation takes literally five minutes. I put this on a 14 foot 2010 Sprinter 3500 truck. Setting ECO to 3+ or 4+ is all about the feeling of headroom. I came across city mode +1 and it was day and night. It was like driving to 35 mph like I was in my Dodge Dakota. I don't know what I'll see with the fuel economy so I'll update after driving a few hundred miles.
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