- camismacho wrote:
- As far as I know once you reset the ECU the car has to "relearn" things like fuel trims etc., which may be why you are getting lower mpgs. You need to drive the car for awhile to get it back to normal. Your engine light will also come back on after the cars learning cycle period. Assuming your header is catless, it will come back on no matter what. My car is full catless and even with an O2 sensor spacer I still get a CEL. But that doesn't seem to impact performance based on what I've read.
A more logical explanation for the decrease is that your foot got a little heavier because you like the way your car sounds lol. Happens to all of us. Unless you're trying really hard to drive economically.
Yeah I'm running with no cats lol. Well I was running about 17mpg before restarting the ECU. I restarted it couple days ago and took track of my mpg now city I'm doing 23-24 and highway about 24-25. Yesterday I noticed my filter from my TRD cai was in horrible shape so I went into autozone and purchased K&N air filter and I've done research that was somewhat the cause of my low mpg. I should be good for now. Also yeah my CEL came back on..