Those mpg numbers are insane! WAY higher than any V6 numbers I have seen. The best I have knocked down on the hwy (70mph driving) is 36mpg with my 2.3 manual. Did you ever check your mpg at the pump to see if your computer numbers are accurate? Or are the numbers that you posted actually calculated from your fill-ups? I have never actually calculated mine - I just rely upon the computer readings. Some day....