05corolla"S"

Hi all, I'm new to the forum. Just bought my first Toyota. 2005 Corolla "S". I bought it for the reputation Toyota has as a reliable car with good gas mileage. So far I'm happy to say my experiance has been close to the reputation. Two questions I had though. One, I seem to be averaging only about 27 MPG, Sticker posted 31/38 and two, Every so often i have a hard time starting the car, meaning I have to turn the key two times to get it started. Any ideas?? Any other advice good or bad on this car would also be greatly appreciated. Thanks All Dave S.