The other side of this "regular gasoline works but is a little dirty" coin is that real Coleman fuel is clean as hell. It is also super stable, and doesn't contribute to any "varnish" or other build up on the nozzles, etc.
My favorite Coleman anecdote was when my mom called me to come finish getting all my old Boy Scout crap out of her garage. This is stuff that had been there literally 20 years as I'd packed it into the rafters sometime before going to college. Included in that box of gear was an MSR Whisperlite stove and two MSR fuel bottles of coleman gas. Out of curiosity, I checked and the bottles still had fuel, though the O-rings on the caps were cracking. Out of further curiosity I screwed the pump into one of the bottles and worked through the pump/prime process to fire up the stove. Fired up on the first try, just as it had when last used. What a pleasant surprise.
I don't use white gas that often these days, but I keep a few coleman stoves and lanterns on hand as well as the MSR that gets used for snow camping (when propane/butane doesn't work that well.)