Repeated contact with gasoline over time does harm the clearcoat.
On my 2003, in the thousands of fuel-ups I performed, I inevitably had a couple of spill-overs where the automatic nozzle failed to function properly, and/or where the idiot who fueled up before me "bo-ob-y-trapped" the nozzle by leaving it filled with gasoline so when I tipped the nozzle down to insert it in the filler neck, a cupful of gasoline "blurped" out on to the paint.
Each time I would immediately do my best to clean it off and apply new wax, but many times it was in the dead of winter and water froze immediately.
Anyway by the end of 12-1/2 years, the area under the fuel door was noticeably dulled and discolored compared to the rest of the truck.