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This isn't a "set". It's just a 25% smaller crank pulley to underdrive everything by 25%.
The udp "sets" that I've seen advertised that include a water pump pulley generally contain a larger water pump pulley to underdrive the water pump even more than the other accessories. The water pump and fan (if engine-driven) are the major parasitic consumers of power.
Some udp sets include an overdrive (smaller) alternator pulley to eliminate charging issues. With most modern alternators, that's not an issue.
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Fuel economy is nice, but sometimes I just gotta put the spurs to my pony! 
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Originally Posted by thatguitarguy
Just 'cuz you can't do it, don't mean it can't be done...
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Originally Posted by elhigh
The presence of traffic is the single most complicating factor of hypermiling. I know what I'm going to do, it's contending with whatever the hell all these other people are going to do that makes things hard.
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