i guess that is a possible cause but 1.5 months? i find it a bit hard to believe that the ECU would cause a jump that drastically in the matter of one fill but ill take it.

the point of my post was to try to find an explination on why my MPG suddenly increased. was i unclear in my initial post? ive searched it. nothing came up. my routine/habbits are quite consistent. so is the weather here in so cal. thank you for offering a possible answer to my question even though you didnt feel there was a point. sorry that my post upset you so much.

 

Ill just throw my mpg in to **** some people off, I drive mostly highway i get 285-300miles a tank, shifting at 3, red line sometimes. I even got 190 miles on half a tank one time driving 30-45 mph on highway bec on snow. I was on that highway for hours, I love my 8.

 

didn't upset me at all, from time to time I get "increased" mpg as well, I never post it doesn't mean it never happen.

my opinion is that unless its something like constant for example 10 times in a row, then I will consider it "worthwhile"

Its just some people here that can't accept my opinion and call me close minded when they don't even know **** themselves.

its ok tho.

and yes, it usually takes a while to build fuel trim. and from time to time the value change on its own, again it all depends on driving condition.

 

i have gotten 285-300 for over a year now,pretty consistent if u ask me. Agreed on conditions there has been a couple times at 265 with a lot of hard driving.