LOS ANGELES, California (CNN)  -- Misha Di Bono zips around town in her Infiniti sport-utility vehicle, breezy and unconcerned about the price of gas.



Misha Di Bono says people used to make fun of her rolling billboard. She gets $500 a month and free gas.



That's because she gets $500 a month -- plus free gas -- for turning her car into a rolling billboard for Jobing.com, the online recruiting company she works for.



"People used to tease me about the 'Jobing' mobile, and now they're like, 'Oh, we'll get Misha to drive,' " she said, standing next to her decal-covered car.



Jobing.com might be the most extreme example of how companies are helping employees during the current gas crunch. But with gas averaging more than $4 a gallon, more and more companies are trying to figure out incentives to help ease the pain at the pump for their employees.  Watch a rolling billboard for your company »



"There's no question companies are feeling the pinch," said John Challenger, the chief executive officer of global outplacement company Challenger, Gray and Christmas. "It's an important issue because no company wants to lose its people."



His firm recently surveyed about 100 human resources executives at white-collar and blue-collar companies. The survey found that 57 percent of the companies offer programs to help ease commutes.



The most popular option was reducing the work week from five eight-hour days to four 10-hour days. Twenty-three percent of the companies polled have such an option, Challenger said.  Calculator: How much do you need to work to pay your gas? »



"We're at a watershed time of how people go to work," he said. "Maybe the gas crisis will be the real trigger."



Other incentives: Twenty percent of the companies offer carpools, and 18 percent pay for the cost of public transportation. Only 14 percent of the companies offer telecommuting options, the poll found.



The survey reports that companies had seen a recent jump in carpooling of 43 percent and a 23 percent increase in the use of public transportation. Still, 31 percent of the companies saw no increase in their employees' commuting behaviors.  See gas prices around the country »



Some of the companies have had the incentives for years, but it's taken the soaring gas prices for employees to look more closely at the programs.



"It's something that is much more important than two years ago," Challenger said. "It's hard to get away from, because you're constantly going back to the gas station."



He added, "It's hitting people's radar screens now."



One company offering generous commuting benefits is online giant Yahoo, which rewards employees who organize carpools, ride bikes to work and take company shuttles to and from offices. Yahoo rewards these green-conscious commuters with free movie tickets, lunches, massages and other benefits. iReport: How is your company helping you



The company recently hired an "employee transportation coordinator" to help devise even more incentives.



"We've really been listening to our employees to make sure we help them find ways to make the cost of the commute a little less excessive," said Barbary Brunner, a Yahoo vice president.



But it is the Jobing.com vehicle that is most eye-popping. Company spokesman Joe Cockrell says the company started the rolling billboard cars in 2001, but only three executives took part in it.



But now, 60 percent of its 270 employees nationwide drive the cars.   Watch a shift from marketing ploy to employee benefit »



"This year, for the first time, we've had a long waiting list for our wrap," Cockrell says. "It's basically a huge sticker that goes on your car and should last in theory about three to four years."



It costs the company about $3,000 to $4,000 to turn the cars into rolling billboards.



They do have rules: The car can't be older
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