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The JB4 maps do not specify or limit the amount of ethanol you can run. The JB4 only has very minor control over your trims so without the BEF you're not able to change the fuel tables. You should be able to run E30 without issues. Post a log in their support section and wait two weeks for a response. Someone will let you know if you need to decrease the ethanol content.
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2011 E92 335i | 11.7@125 SOLD
2017 Camaro SS | 12.7@114 SOLD
2019 Audi TT RS | 10.5@130 SOLD
2020 F97 X3M | 11.0@123
2023 G80 M3 xDrive
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