[QUOTE=badgett]Check this out .....
MYTH: Light oil such as 5W-30 delivers the best mileage. Utter nonsense. Five decades of road testing and engine dyno testing for efficiency has shown that straight 40 or 20W-50 or 15W-40 delivers the best mileage for your car or truck.
HINT: Drain your light oil and switch to a heavier oil because that will reduce friction in the engine and give it better efficiency and wear protection. We use Torco Oil for best mileage. Torco International is found in Santa Fe Springs, California.
What Website??? I wanna see !