Best Gas Mileage Highway and City

[Volvosteel]

I have a 2003 Corolla with 295,000 miles on it now. it would seem aft replacing the Catty and M/Transmission i am back to getting close to 50 MPG on the highway ( depending on weather conditions ) WITH the A/C OFF. with the A/C on it drops to around 43. these are the absolute best numbers ive pulled in this car and my average is 45-48 in average driving conditions again with the A/C off. when my catty started to go i could tell the diff and then when it finally kicked the light on my gas mileage dropped into the 30's. I do not have the Fly By Wire in this car, so im curious are those of us in the 03-04 getting better gas mileage without the Fly by wire system? What are your best numbers in OPTIMAL running condition and then in regular condition? ( oh and numbers reflect taking the tank to the last HALF gallon including reserve ).