I thought I was the only one who liked the smell of gasoline O.o. I also love the smell of the air just before it rains. Just the smell of freshness. I don't know how to explain it :p
This is strange but, Heavy Fuel Oil (Bunkers), also cut grass is top tier and cuprinol (That stuff you stain fences with) and last the smell in the air after it has fished raining but only when your in the countryside so damp grass and plants etc.