I drive a fairly innefficient 95 Mitsu Montero for my 25 mile commute to work. I carpool so I only drive two days a week. Through the past year I have been trying to maximize my mpg. In this quest I have done the following.
-Replaced the 60k old sparkplugs and wires.(NGK double platinum)-Result; absolutely no improvement in driveability or mpg
-Replaced the 165k old oxygen sensor. Result; absolutely no improvement
-Installed 5W20 motor oil. Result; No detectable improvement.
-Increased tire pressure from 30-35psi. Result; no improvement. Although the ride was noticeably harsher.
-Made sure I kept my max speed under 70 mph (normally go up to 80 sometimes). Result; 1-2mpg improvment.
Vehicle runs great. Always has. I guess in the end it all makes sense. Slow down to save gas. However, I thought maybe the new Oxygen sensor would help. You would think it would get weak after 10 years and 165k miles.
-Replaced the 60k old sparkplugs and wires.(NGK double platinum)-Result; absolutely no improvement in driveability or mpg
-Replaced the 165k old oxygen sensor. Result; absolutely no improvement
-Installed 5W20 motor oil. Result; No detectable improvement.
-Increased tire pressure from 30-35psi. Result; no improvement. Although the ride was noticeably harsher.
-Made sure I kept my max speed under 70 mph (normally go up to 80 sometimes). Result; 1-2mpg improvment.
Vehicle runs great. Always has. I guess in the end it all makes sense. Slow down to save gas. However, I thought maybe the new Oxygen sensor would help. You would think it would get weak after 10 years and 165k miles.