Quote:
Originally Posted by gameguru1360
did you use a fuel or oil additive to make it that high?? I've been using Marvel's Mystery oil only in the gas tank and have noticed a 1-2mpg increase. I've only used maybe about 8-16oz in the oil crankcase in between oil changes and the only thing I have noticed is that the engine does sound quieter and a bit smoother.
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Nothing has been done to the vehicle other than regular maintenance. Oil is whatever the dealer uses -- my mom bought the prepaid maintenance when she bought the vehicle.
I did a two drain and refills on the transmission around 42000 miles along with a radiator drain and refill, but that was it. These were premature, but I figured it couldn't hurt.
I use the Chevron Progard stuff maybe one a year, but that's about it really.
