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2007 gmc envoy_sle
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Trinkets like those have been around since the 70s. It does everything your pcm already does so you would be a little redundant. If you don't have a fuel flow sensor existing on your vehicle you might use the fuel and mileage features more than anything else on it.
I might consider putting that on my 62 Galaxie but not on my Envoy. A calculator is just as quick for figuring your fuel mileage as this is. I would pass.
 
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