I got no options at all -- the bare-bones minimum you can get. The only rattle or squeak I've noticed so far is the far back left corner of the dash rattles with the radio sometimes (in time with the music, and stops if you turn it off).

So far I've only added gas once, Chevron but don't intend to stick to a single brand. I do intend to put decent gas in it, the nice thing about the 700-mile range is you can be a little more patient about where you buy gas, can fill up when you find a good price on a good brand.

I agree that the range calculation (and warning) are way conservative, I even though I'd hit an early shut-off and probably overfilled it, couldn't believe it was only taking 16.

BTW I'm pretty sure there are at least 2 other NAH owners here -- Lights and NAHfan