Unless you are seeing below zero temps on a regular basis (like in the winter) you will not benefit in seeing higher fuel economy. I have run synthetic for most of my Corolla's life up until recently and experienced no change in fuel economy, in fact in the Corolla (switched 8000kms ago) I am seeing some of my best tanks yet and its no spring chicken.
If you had a turbo car or in the winter, I would run synthetic.
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2013 Honda Civic Si - 2.4L
OEM front to back belly pan from the factory.
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