According to this Wired Magazine story, UPS is trying out hydraulic hybrids, starting with seven vehicles in '09 and '10. A diesel engine powers a pump pressurizing hydraulic tanks, which then power the vehicle. 70% of breaking power can be reclaimed by these vehicles, and the overall efficiency increase would be "a 50 percent increase in fuel economy and a 30 percent decrease in emissions... ."
According to some of the commentators of the article, the reason this technology hasn't been adapted by car makers is that the hydraulic tanks must be large, hence the application in UPS box trucks.
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