My brother -in- law Adam makes this Tri-Tip roast on his grill & it's so good I had to try it. I did it once with out using a Tri-Tip and it was good but not near as moist, so my advice is pay a little more and it enjoy it a lot more.
All you do is rub in your favorite rub or spices all over it and cook both sides on high for five minutes then reduce heat & continue to cook until your desired liking.
Thanks Adam ! You have a tender yummy roast without heating up the house.