Your problem should be with the EPA, NOT the dealership nor the manufacturer. The manufacturer has NOTHING to do with the "estimates'...AND, they are "estimates", put on the window sticker by the EPA, NOT the manufacturer OR the dealership so you are barking up the wrong tree.
On our Mazda 3, the rating is 28/40. If you look below the BIG numbers on your window sticker, it will have a range. The "3" I have next to me as I type has below the 28 "Expected range for most drivers 23-33". And below the 40 "Expected range for most drivers 33-47". Check your sticker. I'm sure you are within the range below the big numbers. So, if I have a customer that is getting 23/33, EVEN THOUGHT THE STICKER SAYS 28/40, they are well within the range that the EPA has ESTIMATED!
"I understand that they need to sell cars but it does not make it right that they give estimates based on lab tests"
You're an idiot. How else would they base the numbers? Let 100 customers drive the car THEN put the mileage on? Well, that's just stupid.
Tired of people complaining when they don't have any reason to what-so-ever!
That is all...have a nice day!