When I first started driving from one place (my mother's) to another (my place)(65 miles) the gas literally ate me alive. After driving a couple of days from my mother's to my place I was getting VERY good gas mileage. Now that I've been driving to and from school from my place (aprox. 1.5 miles) and then occasionally go to my mom's the gas mileage eats me up again. What would my problem be? I want good gas mileage when I travel the highway to my mother's but then I want good gas mileage while going to and from school. Also, whenever I start my car gas dissappears. So, when I drive to and from school do I keep my O/D off and then turn it on when I go to my mother's????