I had previously owned a 03 FX35 RWD and have recently traded it on for an exact 04 model. The miles per gallon calculation on the 03 was consistently higher in the very same driving conditions. The 03 was higher by at least 1 mpg. On the 03, I would calculate the mpg by hand and compare to the computer and would be within .3 mpg or so of the computer. When I do the same for the 04, my calculations by hand have been higher by 1.0 mpg versus the computer. Any thoughts?