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Old 03-30-2012, 02:13 PM   #3 (permalink)
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Join Date: Feb 2011
Location: Phillips, WI
Posts: 985

Nameless - '06 GMC Canyon
90 day: 37.45 mpg (US)
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It's possible that you're picking up some high frequency noise that's faking out the electronics. If that's the case, you can try twisting the wires about one turn every two or three inches. If that doesn't do it, then you need shielded wire. And shared common returns are always bad.
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.
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