This is an advertisement that came to one of my mailboxes. I think it is something that anyone with an engine on board would like to know about. Check my following site http://home.earthlink.net/~yourcaptain/pix.html You will find this information below the horsepower curves. I hope you save a buck. . Captain Al Pilvinis "M/V Driftwood"--Prairie 47 2630 N.E. 41st Street Lighthouse Point, Fl 33064-8064 Voice 954-941-2556 Fax 954 788-2666 Email yourcaptain@earthlink.net Website http://home.earthlink.net/~yourcaptain