I get some ground sirloin (usually 90/10, I like them more lean), just add some salt, pepper, and a little mesquite bbq sauce. Mix it all up, press them into 3/4-1" patties, and fry 'em up! I have the grill on about 4 (of 10), flip them after about 4-5 min, leave them another 4-5 min, rotate the ones in the front towards the back with one more flip (the front of my grill doesn't get as hot as the back) and definitely don't press them down with the spatula. They end up with this delicious slight mesquite flavor from the bbq sauce and veeeeery juicy.
I let my friend do grill duty while I was making some other stuff one grillout and he pressed the heck out of the patties...they turned out very dry
So don't mash your burgers on the grill! The more you know! hehe