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Old 11-25-2011, 08:48 PM   #16 (permalink)
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Join Date: Feb 2011
Location: Phillips, WI
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Nameless - '06 GMC Canyon
90 day: 33.74 mpg (US)
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Originally Posted by ConnClark View Post
Small piston aircraft have dual sparkplug systems. Part of the warm up and check procedure is to run off one side then the other to check for fouled or faulty plugs or a bad magneto. Normally you run off both and you can usually feel/hear that they get more power from the same amount of fuel running on both sparkplug systems.
I believe that most of the difference goes away if the timing is advanced when running on single plugs. Longer flame travel distance on single ignition needs more spark advance.
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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