Funny, but I ended up cooking a 12-lb rib eye roast (standing rib roast without the bones) myself. This years Christmas day party was at my brother in-laws, my wife comes from a large family and we rotate Christmas day parties each year, and one of the menu items was rib eye roast.
The day before my brother in-law had called asking a few questions as to how to cook the roast on his Weber gas grill and when we arrived for the party a couple more.
'Bout the third question I simply offered to cook the rib eye roast myself, he smiled and said, "well, if you really want to" I refer to this as being Tom Sawyered
I set the front and back burners on his Weber to medium, left the middle off, rotated the meat every 25-30 minutes, took it off at 124I set the front and back burners on his Weber to medium, left the middle off, rotated the meat every 25-30 minutes, took it off at 124 degrees on an Intstant read thermometer and let it sit for 15-minutes.

Perfect for most, but a few unenlightened souls wanted theirs "actually cooked" as in very well done, no pink. I let my brother in-law handle that, it pains me to do that to a nice hunk-o-beef.
All in all a very nice party, sister in-law is a good cook, unlike the one sister in-law who, and yes this is true, bought pre-cooked prime rib from Sam's club last time it was her turn to host. ~shudder~ I should point out that, even though the pre-cooked prime rib was, not to put too fine a point on it, not good, they, as are most in my wife's family, excellent hosts and a good time was had by all.
By the way, I'd like to award Bruce with the Most Mismanaged Prime Rib Award, for his brother in-laws nesco-boiled prime rib.
Enjoy,
Gary