yeh, i learned that the faster u pump ur gas the more vapors it creates in ur tank, now i always do it on the slowest setting. great thing is, our tanks are so small i can usually be filled up (from empty) and be gone b4 alot of the larger vehicles are done fueling

also i hear ur not supposed to fill up when a fuel truck is filling the underground tanks because it stirs all the dirt and sediment at teh bottom and that can be brought up and dropped into ur gas tank.