I drive my car to my girlfriends house pretty often. Its about 13 miles from my house to hers and I noticed when I drive my car granny like shifting at about 2k(I have a SX with the 6 speed manual) I will use about a 1/16 to a 1/8 of a tank. I have a CAI on the car btw. I was driving down the other day and felt a little spirited and was going average of 60 to 65 mph and shifting at 3k and noticed a huge difference in my gas mileage. My needle barely moved at all while driving like this. Anyone else notice this?