[chittychittybangbang]

You'd be hard-pressed to find another vehicle that can go 600 miles on a fill-up

Um...almost every TDI can go 600 miles without 3 extra tanks in the back If I were to put 3 extra tanks in the passat, I could get (reduced each tank range to account for the extra weight and fuel consumption) 900 x 3 = 2700 miles/fill up.

 

[chittychittybangbang]

Someone out there is probably selling a rip off h2 conversion kit.

None of those work, they are crap.

Engines that run on natural gas = legitimate.

A device that you put in the trunk to make your own gas or something that you bolt to the fuel line = scam. The same goes with tornados, magnetic fuel energizers, etc.