Welcome to the forum.
You know what I'm going to say if you've seen me welcome a new member before: get fuel economy instrumentation!
There is nothing like accurate, instant feedback to help you tune your driving style, and help cement your desire to be more efficient, and turn your daily commute into a game (with a resettable trip avg function). With a ~30 mpg car, it'll pay for itself in a reasonable amount of time too.