VIDEO Windows Media Video (6.8 MB) Quicktime Video (7.8 MB) Text Version EPA has changed the way it estimates MPG. Starting in model year 2008, estimates will reflect the effects of Faster Speeds & Acceleration Air Conditioner Use Colder Outside Temperatures What else do I need to know about the new ratings? The tests lower MPG estimates for most vehicles. View old/new MPG ratings for a specific vehicle Convert old MPG estimates to new estimate The actual mileage you get will still vary based on your driving habits, traffic conditions, and other factors. All MPG estimates in Find-a-Car have been converted to the to the new ratings system to help consumers compare the MPG of older and newer cars.