Welcome
There are lots of tricks all over the site, and a lot of people willing to help! You oughta add your car in the garage and start a fuel log, it helps to watch your progress tank to tank
Just search "aero" or "hypermile" or "grill block" and you'll have more than you can read, or you can just click the link below for some quick tips
65+ Vehicle modifications for better fuel economy - EcoModder.com