I just picked up my spec.B a few weeks ago, so I'm new (I refuse to write n00b) to the capabilities of this car.
It seems the first mod everyone says to make is to get a Cobb AccessPort and retune the ECU.
My question is this, will installing the AccessPort and retuning the ECU decrease the gas mileage significantly? It's already mediocre at best and this is my daily driver, so while I would like to boost the power up a little bit, I don't want to do it and get the same mileage a V6 or V8 would get.