At this point, this grill doesn't qualify as "use the most" - or even use at all at this point, but hopefully something will happen this summer...
I believe it to be 1986-1988 Genesis 3:
I need to check the date marks in the firebox and endcaps.
Original swing table bracket:
Early control panel/knobs/igniter, though not as early as the one @Rich Dahl has. We both believe his must have been from the very first run of Genesis grills in 1985-6 for the inaugural 1986 season.
Even came with an ORIGINAL thermometer which I am sure doesn't work but is still so cool:
1988 Genesis 2 Red Head....parents bought it brand new here in Canada for $800 in 1988, still in use at our cottage every week/weekend. Headed in for a restoration in my shop this summer.