My girlfriend has an 2005 Civic EX automatic, but her gas mileage isn't what I think it should be. Her car has 5000 miles on it, had the oil changed at 3000 miles with 5w20 exxonmobil, with OEM filter. She drives a normal of 50 miles round trip freeway, at about 75mph. Her gas mileage is about 30mpg to 33mpg...my scion tc gets that much with a 2.4L! The tank full will only last about 300 to 330 miles before the gas light turns on. Fill up takes about 10.5 gallons or so. The EPA says the civic should get 35-38mpg and my friend who has a 98 Civic EX is getting close to 40mpg! Whats going on? And whats your gas mileage?