I have a 2016 EX-L (4wd) which is rated at 18/25/21. Per the computer, I've been getting around 19-20 mpg since I purchased the car. I suddenly got a check engline light for a cylinder misfire a couple months ago and brought it to the dealer. They replaced all 4 fuel injectors for me under warranty. Ever since that service, I've only been getting 16-17mpg. Could the dealer have messed something up or is it possible there is another underlying problem they didn't fix, but the engine code was cleared by just replacing the fuel injectors?