I've heard some people say that when their ECU is fried they run rich or something. I just put in a new ECU and I guess now I'm kind of paraniod about whether it is working right. I always thought that if it were fried or something that the car would run noticeably bad or not run at all. I got about 2mpg worse on this tank than my old tank, but I drove it slightly harder (hard to say whether gas mileage was actually affected). Any input would be appreciated. Thanks

 

It's your right foot that deserves the blame.
A 2mpg variance between tankfuls is nothing.

If the ECU was "fried", odds are the car wouldn't turn over.

 

Thanks!