The "I can do it, why can't the automakers" quote at the end of the ad kind of bothers me a bit... people still don't understand that what you're doing in your back yard just isn't appealing to the general public in most cases....
I also have a fairly difficult time seeing that car getting 70MPG with 28Hp and still being "fun" to drive. I'm sure it's slow as molasses, and probably doesn't like to accelerate either, since that engine is probably a piece from a mid-size tractor or something similar, which doesn't have variable fuel timing.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"