I just bought a 2010 caliber and getting only 20 mpg and driving like a gramma trying to improve but not happening. Had oil changed , air filter, fuel injectors cleaned, tires checked the spark plugs done and no change. Only 80k don't know what else to do. Drive 60 on Highway. Any suggestions? Car drives fine make and little whinning noise when driving.up big hill and have to hit gas harder but that's not often