ppl will tell you buy an exhaust and buy a cold air intake and blah blah. I got 56mpg with stock intake and exhaust and the closest i've gotten since i did my catback and gmpp intake is 53mpg. Same journey too, so I should have seen better.
A tune might help aswell as proper maintenance. Also you should tell us a bit more about your car (engine, sedan or coupe, transmission, etc.)
I live in Canada and I get 35-38 mpg all city and 44-53mpg highway depending on how fast I want to get home or if I'm bored. According to my dic doing anything above 110km/h results in burning as much fuel as in the city so like Rriggs92 said, staying off the fuel is a major part.
Sry if I jumped around alot, not fully awake yet
2009 Ford Escape Limited - 3.0L, 6 speed auto, 4x4, 25/33 city/hwy imp mpg.
2017 F150 XLT-XTR - 5.0L, 4x4, 3.55's, E-locker, xtr chrome package, fx4 off-road package.
20/25 imp mpg