I have posted this previously on another thread and got some great replies, but here I am back again. After the third or fourth fillup we are finding the MPG is just a little under/over 30. The originals gave 45-50, sometimes 55. I checked the pressure they are all 32 to 34 PSI and air temperature is 30*F. I know pressure drops and rises with ambient temperature. I also read the article that says diameters will be different between old and new set and expect 1% change which for me might be 1MPG, not nearly drop by half. Heck my old 1998 GM van is doing better than prius. What is the recommended pressure for fuel max front and back (I think there is a 2 pound difference). Sidewall says 51 PSI max and I certainly would never go that high. Should I junk these for something else? Everything I read seems to sing praises of this tire. Maybe just go back to Toyota and have them install original equipment tires
New tires reduce MPGs for a while. After a couple months my Fuel Maxes are better than the OEMs. It's safe to inflate tires up to the maximum shown on the sidewall. Mine are at 44/42 front/rear. This would allow a noticeable improvement over 32-34. If you bought new-used and this is your first winter in the car, that's about 2/3rds of the answer.
No change with mine. What size tire did you install ? 185/65 r15? By any chance did you go with a 195/60 r15 tire? You are running very low air pressure as well. Hal
My Fuel Max are same size as originals. I will inflate them tommorrow to 44 front, 42 rear and see how the MPG works out.
