About Author Sam Otoner : Sam Otoner is an author writing about automotive related topics, and you are invited to visit his website covering number of aspects about auto parts. http://www.autopartblog.com/ … This caution saves money on the car itself, repair bills, and even gas to keep it running. You must keep your engine tuned up. Your fuel efficiency can be cut by thirty percent when you have an un-tuned car . Obviously, this leads to less cash in your pocket. …