my first tank of gas in my 2007 aveo sedan 5 speed got me 31.2mpg! now that might sound bad but i havent drove a 5 speed in years. ok so 2nd tank i installed a k&n drop in filter and the gauge looks better but the answer will come tommarrow when i fill up. changing timing belt friday so i guess next week i will see how things go and may change plugs also and did change to mobil one after first tank.