Maybe I got in the habit of shutting it off to fuel it in the sixties. My hot rods of that era were so fuel hungry, that the only way I could top off the tank was to shut it off while fueling or it would burn the gas faster than I could pump it in. Good thing gas was $.23 per gallon.
I want to make it clear that I don't think that shutting off the engine should be the law either. I just don't see the point in burning fuel for nothing. How much trouble can it be to turn off the engine, then restart it when you're ready to go. Maybe a chauffer is the answer.
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in