So this is my 3rd oil change and they used the correct oil this time. Either my foot is getting heavier and I am more aggressively driving or something is wrong. Anyone have any thoughts? Tire pressure was adjusted same time they changed oil and rotated tires. I was getting an avg of 29 now I am down to 27. I know it's only 2 mpg but still I expected at 15,000 miles mpg would go up not down!