Hickstah hea. 93 oct good,, 110 leaded not good unless you want to blow out your catlyst ic per verters, fuel pumps, exhaust gaskets, a many fuel rails and many other parts that will BURN out. Learned the hard way about gas ole ine allys that are selling race fuel unleaded and happens to be $8.88 leaded fuel. The car does not like that crap at all. The ally was even advertising it as unleaded until I threatened to sue. Young kid finely came across as to what it was. Usually sold close to a track. Will mess up quiet a few female parts. I was lucky, viewers will attend to, know I got away with the FCA rep and dealership backing me up,, as to spending too much $$$ for this con trap tion any way. Just be care fuel when these codes blow. Have a story in pocket and in my case take the rep from up north to a good grouper sandwich shop in Fl. During the winter months. Blamed the problems, all paid for, on the K & N CAI. Most expensive ever installed.