Thread: Diamond Lube
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Old 12-29-2013, 04:10 PM   #129 (permalink)
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JRMichler's Avatar
Join Date: Feb 2011
Location: Phillips, WI
Posts: 985

Nameless - '06 GMC Canyon
90 day: 37.45 mpg (US)
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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.
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.