A new study says that eliminating the parking perks of government employees could save New York City $46 million.The Daily News reports that the study, commissioned by the Transportation Alternatives advocacy group, found that almost 20-thousand fewer vehicles would enter the city each day if government workers didn't get free parking and had to spend as much as their private-sector counterparts.The study says the freed-up parking spaces could generate $46 million in parking revenue.A spokesman for the mayor says the city has reduced the number of free-parking allowances by 12 percent since last year.