https://www.metrotimes.com/detroit/effuel-reviews-is-effuel-eco-obd2-fuel-saver-a-legit-or-scam-does-it-really-work/Content?oid=26944886 Automobiles are generally grouped according to their features. There are luxury sedans, sport utility vehicles, performance automobiles, compact cars, mid-size cars, and large-sized sedans. Each class has its own unique set of characteristics such as engine size, transmission type, style of body style, and braking system. Luxury automobiles are generally thought of as having higher market values, greater resale value, as well as better appearance. High end luxury automobile manufacturers such as the Cadillac, Mercedes, BMW, and Lexus are the most successful auto brands in North America.more