Fixing a car that is noticeably out of tune or has failed an emissions test can improve its gas mileage by an average of 4 percent, though results vary based on the kind of repair and how well it is done.  Fixing a serious maintenance problem, such as a faulty oxygen sensor, can improve your mileage by as much as 40 percent.  A Lug Nutz professional tune up will increase the longevity of your vehicle and improve gas mileage.   Our trained certified auto repair technicians can determine what needs to be done on your vehicle, but tuning up an engine can help improve gas mileage especially if you have a faulty oxygen sensor.  Contact us or come by and visit for a free evaluation and quote.  Lug Nutz Truck and Auto Repair (435) 251-8778  OPEN 7 DAYS A WEEK.