Thread: Diamond Lube
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Old 12-29-2013, 04:10 PM   #129 (permalink)
JRMichler
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Join Date: Feb 2011
Location: Phillips, WI
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Nameless - '06 GMC Canyon
90 day: 37.45 mpg (US)
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Tragicomic

What we have here is looking more and more like a snake oil salesman selling a legitimate product.

A 2% MPG gain is over $1000 per year for a semi truck. Fleet operators would jump at it if the product was priced appropriately.
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The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.