I bought one of these and it's not accurate enough to easily be able to tell if the road grade is just a tad positive or negative. It's a good item, but definitely not worth it's weight in a hypermilers car. I hardly ever glance at it. "Seat of the pants intuition" will give more useful information. For anyone curious, accelerating and braking are noticeable using a gravity "level gauge." However if your just coasting down the the road anyway it's good enough. I give it a don't buy:not worth it's weight.
You really need a digital leveling gauge with number readouts that go into the tenths of a degree to be useful.
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Originally Posted by Nevyn
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