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November, 2014, I changed motor oil in my Mustang. I'd been running Motorcraft synthetic blend 5W-30. I switched to Mobil 1 full synthetic 0W-30. Fuel economy gain was about 1.6% or .5 MPG.
Mobil 1 website states that switching to their synthetic 0W-** synthetic oil can give increases of 0.2% to 2.0% in fuel economy. Since I drive shorter trips in my commuting, my fuel economy increase was closer to 2%.
A 10% increase in fuel economy would require some serious mechanical and/or aerodynamic modifications and/or significant adjustments to the "nut behind the steering wheel". Synthetic oil won't make that much difference.
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Fuel economy is nice, but sometimes I just gotta put the spurs to my pony! 
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Originally Posted by thatguitarguy
Just 'cuz you can't do it, don't mean it can't be done...
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Quote:
Originally Posted by elhigh
The presence of traffic is the single most complicating factor of hypermiling. I know what I'm going to do, it's contending with whatever the hell all these other people are going to do that makes things hard.
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