I have a Honda Accord v4 from 2006. Recently, I have noticed that my car is around 2500 rpm at 55 miles per hour. My mpg is heavily affected by this as I get 20-25 in combined driving. I was watching some YouTube videos and found that this Accord is normally around 1500 rpm at 60 miles an hour. So my 3 questions are one, is it true that my car should be around 1500 rpm at 60mph(not sure if the video was right) or is there some sort of problem and if so what is it, or is there nothing to worry about?
Thanks in advance.