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ORIGINAL: mazda046s

I recently just bought a 2004 mazda 6s with a V6 220hp. When i bought it had 31,000 miles.As you know it holds 18 gallons of fuel.  i just filled up on gas a few days ago and drove roughly 200miles and i have a 1/4 tank left. im driving about 60% city and 40% on the highway but there is some stop and go.  On a 2004 in the city i should be getting 17-19 and on the highway 24-29. But im geting about 14. Im not flooring it or anything stupid. 3 days ago i checked the oil to see if was dirty. so i took off the filter and it looked ok so i tiightened it back up. ( and yes i know the dealer recomends they do it, because they have a special wrench or something) so i turn the car on and the filter shoots off so i had to put a new filter and oil. After doing so my car began smoking from the back and front probally because there was oil burning.  this problem stopped today. I no this is long but if your still reading, do you have any ideas why im getting such bad gas milleage.