An inspiring project - but don't forget its measured in US gallons that are bigger (20oz per US pint, 16oz per UK pint, so 177mpg in the UK)
I'd rather have the new Kia diesel car - 92mpg on the extra urban cycle which is a stunning achievement. Take a passenger and it beats the "C5 on steroids". Having a wheel at each corner is jolly handy, it probably tows a small boat also.
-Paul