I'm curious is anyone has check the computer against actual numbers for fuel mileage. Tonight I filled the tank for the second time on my Sonata with the 3.3 L According to the trip computer, I was getting 22.1 mpg. According to actual calculations, I was getting 21.57. IMO, that is accurate enough considering the variables in topping off and the methods the calculator would use. . This is a combination of light city and highway. My LeSabre would normally get 22 to 23 under the same conditions. With only 600 miles, I think it should get better once broken in a bit more. OK, if you want to get technical, it was 21,56739811922257053291536050157 but for practical purposes, rounding it up to 21,567398119222570533 is close enough.