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Old 05-13-2018, 05:49 PM   #40 (permalink)
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JRMichler's Avatar
Join Date: Feb 2011
Location: Phillips, WI
Posts: 982

Nameless - '06 GMC Canyon
90 day: 37.45 mpg (US)
Thanks: 188
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Update for results of the air dam that was installed 12-3-2016. Average mileage before the new air dam:
Winter 2015-2016: 31.75 MPG
Summer 2016: 38.6 MPG

Average mileage after the air dam:
Winter 2016-2017: 33.0 MPG
Summer 2017: 37.6 MPG. This summer was colder than normal.
Winter 2017-2018: 30.7 MPG. This was the coldest winter yet, and with the most headwinds. Only about 5% of the total winter miles were with a tailwind or zero wind. All other miles had headwinds.

The new air dam apparently does not affect the gas mileage. This is not a surprise because it is only slightly (about 1/2") lower than the factory chin spoiler. It has, however, survived several impacts with snowbanks without damage.
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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