Quote:
To get moving you simply turn on the treadmill and wait for the "engine" to start trotting. The horse's movement, aided by 20 gears, recharges the treadmill's battery, and keeps the vehicle moving. It can go at quite a canter, reaching 28mph during a road test.
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I'm guessing that's a battery-aided 28 mph.
Full article, which also discusses the cooling system for the "engine" and the touchy subject of "emissions" :
The Naturmobil is the ultimate green car | Environment | The Guardian