Update!
I have an Ultra Gauge since I have been wanting a 5/6th gauge and it was cheaper than a scangauge e to piggyback. Also... since the temps have dropped, the corrolla is acting up, giving poorer mpg and such
. One day I drive eco friendly and bearly get 40mpg, and the next I race to work @ 10-15mph faster and get nearly the same mpg. Of course it goes the oppsite way, just kind of depends what it wants to do, have had trips as low as 35mpg when before I never gotten under 40, even racing to work speeding, no coasting etc.
Things I have noticed when it is acting up...
High Idle while coasting in neutral
Low efficency cat code has poped in a couple of times while getting the poorer mpg
seems to be running richer than before at any given rpm including the "high mpg mode" which I can't keep it in when it is acting up
DFCO only works in lower gears at higher rpm
Betwen a little research and a wild guess, I'm targeting the O2 sensors, and/or a dirty IAC valve, to maybe dirty fuel injectors. Really hoping the cat isn't plugging up....
It does seem to work better when the temps are above freezing, and it acts up at and below freezing, maybe water/mist related in some way.