Having bought 14 new vehicles, NOT ONE has met the window sticker for milage. I-90 (Thruway) is relatively flat from Syracuse to Buffalo. I set the cruise at 62 mph in almost every one of them to see what vehicle would be the winner. Everyone runs 70 plus, so imagine my disgust, being blown by, by a Yugo carrying 5 people stuffed in it... BUST ! It felt like I was a one car funeral in every single trip.
Your milage may vary!
I kept complaining about my 01 Silverado. They reworked the computer, and I picked up about 2 mpg. Ya gotta keep whining!