62.56mpg with my Civic. Previous best was 59.37mpg last tank, then back to last September at 58.53. Reason? Maintenance! Replaced brake pads, discs, found a spring keeper missing
from one of my rear brake shoes, and most noticeable difference came from replacing a drive shaft with a worn out CV joint. Now that I do my own wrenching I'm finding lots of mistakes and short cuts taken by the garage I used to take it to.