I bought a used 2003 HCH used in April, and the previous owner forwared me a notice from Honda about a ECM module update that the car was supposed to get last year, but he never did. Well, I just had it done, along with an update of the IMA system. Did anyone notice any difference when they had it done? I get awesome gas mileage now (my goal is 51 mpg per tank) and hit it almost everytime - even when my wife drives it. (Best tank so far is 55 mpg). Hope that doesn't change.