Considering you can't hardly fill the darned things because of the lean angle,
For this reason, I fill-up while remaining seated and holding the bike upright. Interestingly (to me at least), the Bonnie tank design accounts for this as the fill port is fully upright when the bike is on the sidestand.
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Especially since there's a good chance the person fillining up next to me has a cigarette in their mouth, a cell phone in hand, and their car running while they fill. I'm more concerned with being able to drop and roll without having to hop from the bike whilst squeezing in that extra drop.
Not to mention gasoline on the nuts!