Hello and welcome to the club.
You should start by knowing your car’s EPA rating located at FuelEconomy.gov
and make sure to read the article “Beating the EPA”
Make sure you air your tires up to the maximum pressure indicated on the tire’s sidewall.
Also, consider purchasing a ScanGaugeII
. It is an invaluable source of information and will quickly pay for itself in fuel savings.
However, please be careful as hypermiling is addictive.