Scotty, I have a 2015 Mitsubishi Mirage 5 speed with only 46,000 mi. For the first couple of years I was achieving 50+ mpg. Within the last year it's been difficult to reach 45mpg. Dealer didnt find any codes. All pm's have been performed every 5,000 mi. I replaced the tires back in July, but this was going on before the tire change. The car still performs like it always has. What are your thoughts?