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.