I had a ‘92 Honda Civic VX that the factory claimed would get 55 mpg on the highway. I was able to get 58 on one tank of gas and became obsessed for a little while. I began inflating the tires (165 70R-13)to 40 psi, then 50, in an attempt to get to the magic 60 mpg. I made it and decided to keep pushing the envelope…