does everyone one on here forget that when its cold the motor requires more fuel. wich is why the e85 wich is usually 83 is backed up to 70 percent to richen the motor for cold weather. the computer needs to know nothing the added fuel is taken care of. and yes if u havent figured it out 70 percent dosent support as much power. but do you really need a car set to kill in december, jan, feb,