Service technicians everywhere agree that changing your automotive air filter is the easiest and cheapest way to prolong your car’s life and performance levels. According to a study conducted by Oak Ridge National Laboratory, replacing a clogged air filter can improve acceleration time by 6 to 11 percent and in some cars improve fuel economy by up to 14 percent! That’s certainly worth the $20 you’ll spend on a new air filter. Most auto manufacturers recommend changing the filter every 12 months or 12,000 miles, but this is not a fool-proof plan. If you drive in excessively dusty or polluted environment – like Arizona or Texas – your air filter may need to be changed more frequently. Your best bet is to simply pop off the cover and take a look. If the folds of the filter contain leaves, twigs, and visible collections of dirt and grime – it’s time.