I purchased a 2017 Toyota Corolla IM July 14, 2017 from Daytona Toyota ,it's rated 28 city-36 hwy- 31 combined the best I got so far is 23.5 mpg . I took it in and Aaron (head mechanic) hooked it up to his laptop and the gas mileage improved immediately . Today I took it in for the full gas mileage test and after 74 miles of driving , the cars computer, Aarons laptop, and filling it up at the same gas pump and doing our own math all 3 matched at 40 mpg. I'm a very happy customer, now, and Aaron was great!!!