"It is much easier to increase your fuel mileage than you think. There are many things that affect your mileage in a small way, but when you put them together, they can save you $300 - $700 a year in gas. That could buy you a nice little vacation, couldn't it? I will give a lot of suggestions, you can pick the ones that suit you the best.
The first thing is speed. Most people do not know that the smallest difference in travelling speed has a large effect in fuel economy...
... Higher-octane gas (super unleaded) does not give your car more power or better fuel mileage. It means your car is more resistant to detonation. Purchasing the more expensive, higher-octane, premium fuel provide no benefit to most cars. The only reason to use high-octane gas is if your car is starting to ping..."