Shaun Eli wrote:

One thing I have noticed, though, is that the NG grill can get MUCH
hotter than the propane grill. It may be the fuel or perhaps there
was a design change over the years between manufacture dates (Weber
says the fuel should make no difference in temperature).

NG produces almost 10% more BTU's then propane, so the NG grill should get
hotter, just like you see.

Why Weber says it should make no difference doesn't make sense, other then
for marketing reasons.