Originally Posted by SleepNMnky
Have you computed it yourself or are you relying on the on-dash gauge. The gauge is over by 1-3 mpg from what we've all gathered.
Actually the on-dash display may very from being low, accurate, or high. After about 5/6 tank fills, you can ask you dealer to adjust it (they have the procedure). You will need to let them know of the deviations in 1% intervals. This is the procedure that is also used to set the outside temperature that is displayed (an additional step in that same procedure/matrix).
You can also do this yourself; however, it looks to be a real PITA.