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I was running full E85 when the engine blew in January. I filled every two days and burned 10 gallons in those two days. I was saving $4-5 every fill up over E30(93 and E85) and 93 octane. That’s with the mileage drop from 28-29 to 24-25 mpg. E85 was $1 cheaper at the time than 93. All on a 450/450 tune running a G25-550 and 4 port auxiliary fuel.
 

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Did you break it out by cost per mile at all? I'd be curious to see that. My fuely app has a guage you can add to track that over different time periods but it's just dividing cost by miles
Round trip two days was 240 miles exactly. I don’t remember what the price was just it was $1 different. I did the math back then.
So 10 gallons at say $2.= $20 for two days at 240 miles. [email protected] $3 X 8 gallons= $24 so that’s where I got my number.
 
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