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Not sure about the gas mileage but make sure to check your fuel pump relay. The relay activates the fuel pump. As a backup and part of the normal system, the fuel pump will engage after enough oil pressure is built up and will overide or turn off the relay. This creates a long crank time when cold if the relay is bad and it's waiting for that pressure to build to engage the fuel pump. When hot, pressure is still high so will engage the fuel pump right away. A good way to tell is when car is cold, turn the key (don't start) and listen for the fuel pump to whine. If you don't hear, replace the relay. Mine is in the glove box.