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Went through my test tank - that didn't take long.
E85 was about 10% less than 87 octane.
MPG was about 17% less.
So based on cost per mile the experiment failed.
Performance wise the engine really runs well on alcohol. Seems to idle more smoothly and had better throttle response. I will switch back and forth for a while to see if the performance improvements are actually real. Of course, it could be the crappy winter gas we get in the Midwest.
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Randy
'87 911 Targa
'17 Macan GTS
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