Poor Poor MPG - leak?

[leelowe1]

Hi guys and gals. I am a new forum member, 1st time car owner and 1st time yaris owner. I recently (2 weeks ago) bought a 2010 yaris sedan and unfortunately, the excitement has worn off.

I just found out that the car was in an accident (not indicated on the car fax report- the repairs were done mostly on glass and such) and i am getting terrible mpg. I am talking about 200-230 per tank and my driving is not that bad. A few times i have noticed stains under the car where i've parked so i am wondering if something is amiss. I know nothing about cars so what would i ask a mechanic to look for? I also feel the need to get the whole car checked again as im not sure why the initial mechanic did not pick up any issues.

Any suggestions are welcomed.

If anyone is from the NYC area and can recommend a mechanic that is decent and affordable, i'd appreciate it