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I run e-30 I ran it stock with the long tube headers and all cai now with the tune. am soon going to tune it especially for e-30. ethanol runs lean witch is hotter witch means it burns clean so if all your doing is driving around would not even think twice, but with the tune it leans it out plus ethanol leans it out so be careful not to pull the truck for to long like towing long distance with a tune not set for e-30

 

I'm confusing