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Old 12-05-2018, 11:10 AM   #23 (permalink)
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Join Date: Feb 2011
Location: Phillips, WI
Posts: 978

Nameless - '06 GMC Canyon
90 day: 32.16 mpg (US)
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Your charging system is designed for people that never kill the engine to coast. When I was commuting 3 miles each way to work, a good part of each trip was engine off coasting. I found that I needed to put it on a charger once a week to top up the battery. I learned this after a dead battery episode. A 2 amp charger is large enough if you use it often enough.

If the voltage is holding over 14 volts, the alternator is working correctly. If you monitor the voltage when on a charger, the charging voltage will gradually increase to 14.8 volts, hold there for a while, then drop to 13.3 volts and maintain at the level. That's what is needed to fully charge your battery.
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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