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The problem with inclinometers is they are affected by curves and movement.
You know, what happens when you drive through mountains.
The most reliable slope gauge I have is actually my scan gauge. The instant MPG reading will tell you if you're going up or down hill or flat. When it's reading 15 MPG I'm going up a 7 percent grade. When mine hit's 60 mpg, I can shift into neutral and coast. Anything steeper (more INSTANT MPG) than that going down hill and I will gain speed.
These speeds are only true at 60 mph, give or take.
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