I daily drive my stock wrx. It has always avg. around 27 unless I drive all hwy and I will maybe get 30. Last night coming home on fumes I couldn't help but notice we avg. 36mpg on the vehicle ignition mpg... How is that even possible? I didn't think these cars were capable of that. At the same time the total mpg went from 27.6 to 25. Not exactly sure how one could increase by so much but yet the trip meter mpg decrease. Course I could be reading to much into it and just need to turn the mpg off. That's just how it was setup when I bought it.