Hello there, the ATK NORTH AMERICA 4.7L Stroker Jeep Engine's can be ran with 87 octane gas. Any company will tel you to run a better gas to get the best over all performance. Shop with us anytime, on your schedule. Browse 4WheelParts.com, call our customer service center, or come visit us in one of our stores. You can even save on shipping costs by shopping online and picking your order up in a store. No matter which method you prefer, we’re ready to help with excellent parts, advice, and service.